CA1111115A - Planar pi multi-filter having a ferrite inductance for pin filters in electrical connectors - Google Patents
Planar pi multi-filter having a ferrite inductance for pin filters in electrical connectorsInfo
- Publication number
- CA1111115A CA1111115A CA288,504A CA288504A CA1111115A CA 1111115 A CA1111115 A CA 1111115A CA 288504 A CA288504 A CA 288504A CA 1111115 A CA1111115 A CA 1111115A
- Authority
- CA
- Canada
- Prior art keywords
- contact
- electrical
- shell
- electrically connected
- ferrite
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/66—Structural association with built-in electrical component
- H01R13/719—Structural association with built-in electrical component specially adapted for high frequency, e.g. with filters
- H01R13/7195—Structural association with built-in electrical component specially adapted for high frequency, e.g. with filters with planar filters with openings for contacts
Landscapes
- Details Of Connecting Devices For Male And Female Coupling (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
- Coupling Device And Connection With Printed Circuit (AREA)
- Filters And Equalizers (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
This invention relates to filter structures for filter pin electrical connectors, and is more particularly concerned with pi filters for filter pin application. The prior art recognizes several approaches to the provision of pi filters for filter pin applications. Generally speaking, the pi filters have heretofore taken up too much space and were expensive. As an example, it is common in the art to provide a two unit multicapacitor with a ferrite insert and to connect the struc-ture between the pin contact and the metal shell of an electrical connector. This requires two contacts to the capacitor terminations in two locations, one for each capacitor. An electrical connector assembly constructed in accordance with the present invention comprises a metal connector shell which carries a dieletric member therein. The dielectric member includes a contact passageway therethrough for receiving and mounting a pin contact. A hollow tubular inductance, in the form of a ferrite tube, is provided for receiving the pin contact therethrough.
The ferrite tube has an inner electrical contact area on the inner surface which is electrically connected to the pin contact and at least one outer contact area on the outer surface which is electrically connected to the inner electrical contact area. A plurality of planar capacitor ground plates are spaced apart and connected in common to the metal connector shell, while another plurality of capacitor plates, the positive plates, extend between the ground plates and are electrically connected to the outer contact area of the ferrite tube.
This invention relates to filter structures for filter pin electrical connectors, and is more particularly concerned with pi filters for filter pin application. The prior art recognizes several approaches to the provision of pi filters for filter pin applications. Generally speaking, the pi filters have heretofore taken up too much space and were expensive. As an example, it is common in the art to provide a two unit multicapacitor with a ferrite insert and to connect the struc-ture between the pin contact and the metal shell of an electrical connector. This requires two contacts to the capacitor terminations in two locations, one for each capacitor. An electrical connector assembly constructed in accordance with the present invention comprises a metal connector shell which carries a dieletric member therein. The dielectric member includes a contact passageway therethrough for receiving and mounting a pin contact. A hollow tubular inductance, in the form of a ferrite tube, is provided for receiving the pin contact therethrough.
The ferrite tube has an inner electrical contact area on the inner surface which is electrically connected to the pin contact and at least one outer contact area on the outer surface which is electrically connected to the inner electrical contact area. A plurality of planar capacitor ground plates are spaced apart and connected in common to the metal connector shell, while another plurality of capacitor plates, the positive plates, extend between the ground plates and are electrically connected to the outer contact area of the ferrite tube.
Description
The primary object Or the present invention is to provide a pi filter for use in electrical connectors as pin contact filters.
A more specific object of the invention is to provide a pi filter of simple structure, which is easily constructed, requires a minimum of handling in the overall assembly procedure, and which can be economically produced.
According to the invention, the pi filter comprises a pair o~ capacitances which are somewhat similar in nature to the capacitance~ disclosed in prior art. The two capaci-tances have their grourid electrodes connected in common and to the metal shell of the electrical connector, while their other electrodes, hereinafter called positi~e elec-trodes, are connected in two groups, with each group con-nected to opposite areas of a ~errite tube. ~he rerrlte tube receive~ a pin contact therein and carries a metaliza-tion at least partially on its inner surface and over two spaced areas of its outer ~urface by which the two groups of po~itive electrodes are connected to the pin contact.
An eleotrical connector a~embly constructed in a¢cordance with the pre~cnt invention compri~es a metal c~nnector ~hell which carries a dielectric member therein.
The dieleotric member includes a contact passageway there-through for receiving and mounting a pin contact. A
;i~ hollow tubular inductance, in the form of a ferrite tube~
i~ provided rOr receiving the pin contact therethrough.
The ferrite tube has an inner electrical contact area on I the inner sur~ace which i~ electrically connected to the i pin contact, by a spring contact, by soldering, fusing or ~o the like, and at least one outer contact area on the outer sur~ace which is electrically connected to the inner elec-trlcal contact area. ~he inner and outer electrical con-tacts area are advantageously constituted by a metalization ,. . . .
, . - . : . ~ . : . ' - ' 1~111~5 carried by the ~errite tube. A plurality o~ planar capaci-tor ground plates are spaced apart and connected in common to the metal connector shell, while another plurality o~
capacitor plates, the positive plates, extend between and spaced ~rom ground plates and are electrically connectcd to the metalization over the outer contact area of the ferrite tube.
More speci~ically, an electrical connector assem-bly constructed in accordance with the present invention comprises a metal connector shell and a dielectric mounted wlthin the shell. The dielectric is commonly termed a dielectric insert and includes a plurality of passageways therethrough which extend spaced apart parallel to the longitudinal axis of the connector assembly. A plurality o~ elongate pin contacts extend through respective ones o~
the contact passageways and are received in respective ferrite tu~es. The ~errite tubes each include spaced ends, an lnner surface and an outer surface and each carries at least one metallic layer which extends over spaced areas of the outer surface, over the ends and over at least spaced areas o~ the inner sur~ace. The metallic layer i~ electri-cally connected to the respective pin oontact either at the ends o~ the ferrite tube or by means o~ a spring contact carried by the pin contact. Each pin contact and its associated ferrite tube i8 provided with a pair of capacitors.
The ground electrodes of both o~ the capacitors are con-nected in common and further connected to the metal connec-tor shell. m e po~itive electrodes of one capacitor of the pair of capacitors are connec~ed together and connected 3 to the metallic layer carried over one area o~ the outer sur~ace of the ~errite tube. Similarly, the positive i electrodes Or the other capacitor o~ this pair o~ capacitors ~ are connected in common to the metallic layer over the other ':
i. . . .
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area of the outer surface of the ferrite tube. Thus, the two capacitors and the ferrite tube constitute a pi filter for the pin contact which extends through the tube, Advantageously, the metallic layers which constitute the plates of the capaeitors may have different plate areas and thus provide different capacitances, and thus different filter characteristics, for the respective pin contacts, The invention is particularly directed toward an electrical connector assembly having a metal connector shell aDd a dielectrie member carried in the shell, The dielectric member includes at least one contact passageway extending therethrough, An electrical contact is mounted in the passageway. A hollow tubular inductance member is provided having an inner surface and an outer surface, The electrical eontaet extends through the hollow tubular inductance member.
An inner eleetrieal eontaet area on the inner surfaee of the induetanee member is electrically eonnected to the electrical eontaet, and at least one outer contact area on the outer sur~ace is eleetrieally eonneeted to the inner electrieal eontaet area, A plurality of radlally extending ~irst planar eapaeitor plates are spaeed apart and eleetrieally eonneeted to the outer eontaet area; and a plurality of radially extend-ing seeond eapaeitor plates extend between and are spaeed ~rom the first eapaeitor plates, The seeond plates are eleetrieally eonneeted to the metal eonneetor shell, The first eapaeitor plates, the seeond eapaeitor plates and the indue-tanee member eonstitute a filter, Other objeets, features and advantages of the inven-tion, its organization, eonstruetion and operation will be best understood from the following detailed deseription taken in eonjunetion with the aeeompanying drawings, on whieh:
i FIGURE 1 is an enlarged isometrie view, shown _3_ ' partially in section, of an electrical connector assembly constructed in accordance with the invention; -~
FIGURE 2 is a greatly enlarged sectional view of a pi filter constructed in accordance with the present invention;
FIGURE 3 is a schematic illustration of two pi filters having different filtering characteristics due to different sizes of capacitor plates;
FIGURE 4 schematically illustrates a typical ground electrode pattern which may be utilized in practicing the present invention;
FIGURE 5 schematically illustrates a typical pin or ;:
positive electrode pattern which may be utilized in practicing the present invention;
FIGURES 6-9 schematically illustrate, in sectional elevation, a pi filter of the present invention having a non-removable pin contact and the method of fabricating the pi filter; and FIGURE 10 is an electrical schematic circuit . .
:" ' -.
" ' ~r~ -3a- ~
' ' .. .. . . . . . . . .
: - . :. - ~ - . :
diagram o~ a pi filter attained by practicing the present invention.
Re~erring to FIGURE 1, a pin contact connector assembly is illustrated and generally referenced 10. The connector assembl~ 10 comprises a generally annular metal shell 12 having a ~ront end 14 for telescoping engagement with the shell of a mating connector (not shown) to electri-cally connect pin contacts, such as 16, in the shell 12 with the receptacle contacts of the mating connector under 10 a desired axial pressure. ~-The pin contacts 16 are each received in a respeotive contact receiving pasæageway 18 o~ a rear di-electric retention insert 20 which is secured in the shell 12, Ea¢h contact passes through a respective aligned passageway 21 in a dielectric disc 22, an aligned passage-way 23 in a silicone rubber cushion or disc 24 and then extends through a respective aligned passageway 26 in a filter assembly 28. The pin contact 16 further extends ~-through an aligned passageway 29 in a conductive elastomer or disc 30 and pro~ects through an aligned passag~way 31 in a ~ront dieleotrio insert 32 which is seoured ln the shell 12 to enable the engagement of the pin oontact with the re¢eptacle contaot o~ a mating connector.
The dieleotric retention insert 20 is provided with oonventional retention tines 34 which extend into eaoh pas~ageway 18 for engagement behind the rear radial ~aoe of an enlarged diameter portion or shoulder ~6 on the oontact '~ 16 to prevent retraction unless the ~ingers ~4 are spread by a suitable tool. The ~ront radial ~ace o~ the shoulder 36 engages the rear ~ace or projection ~8 o~ the dielectric ; disc 22 to limit forward movement o~ the contact 16. A
oonductor (not shown) is seoured to the rear end of each contact to provide an electrical connecltion therewith, and L~ ~:
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a conventional grommet (also not shown) is secured to the shell 12 to protect the connection.
As best illustrated in FIGURE 2, the filter as-sembly 28g more specifically a pi filter assembly, is illus-trated as comprising a plurality of ceramic discs 40 of a suitably high dielectric constant which are bonded together to form an integral structure. An intermediate ceramic disc 46 is provided in the integral structure as an element which aids in de~ining two separate capacitors, as will become apparent ~rom the description below. The integral structure includes a pl~rality o~ radially extending metal capacltor plates 42 and 44 in alternate axially spaced positions, the plates 44 constituting the ground electrodes and the plates 42 constituting the positive electrodes.
; All of the ground electrodes 44 are connected in common by a peripheral metal layer 48. The metal layer 48 may con-tact the metal shell 12~ however, a more positive grounding contact occurs ~hrough the engagement of the ~orwardmost plate 44 with the rearward radial face of the conductive elastomer disc ~0.
The ~orward posltlve capacitor plates 42 have been more speclfically referenced 42a, while the remaining, rearward, positive plates have been referenced more specifi-cally as 42b. The filter ~tructure is provided with a metal layer 50 which is electrically connected to the electrodes 42a, and with a metal layer 52 which is electri-cally connected to the electrodes 42b. The metal layers 50 -and 52 there~ore de~ine separate terminals for separate ; capacltors, while the metal layer 48 defines a common termi-~0 nal ~or both capacitors.
The capacitor structure receives a ~errite tube 56 therein, the ferrite tube carrying a metal layer having a portion 58 which extends over the inner sur~ace of the !
.
- ~ . . .
~11115 tube, portions 60 and 62 which extend over the ends of the ferrite tube, and portions 54 and 66 which extend over spaced areas of the outer sur~ace of the ferrite tube~
The metal layer portion 66 is electrically connected, such as by fusing, to the metal layer 50, while the layer portion 64 is electrically connected to the metal layer 52. A
gap 54 defines a separation between the two capacitors on the outer surface o~ the ~errite tube 56. .
Advantageously, the above structure requires only a single electrical connection to the pin contact 16.
In FIGURE 2, this single contact is provided by way of a spring contact 68 which is recelved in a reduced d~ameter portion of the pln contact 16 so as to abut a ~orward shoulder 70 and a rear shoulder 72. A similar structure is illustrated in FIGURE 1 where a spring contact 69 is provided on a reduced diameter portion of the pin contact 16 to abut a forward shoulder 71 and bear against an out-wardly tapering portion 73.
Referring to FIGURE 3, a schematic cross sectional representatlon o~ a typical three layer pi filter i8 lllus-trated ~or two pin contact holes. The three layers of ceramlc dlelectric material 74 carry ground electrodes 76 which are interconnected by a metal layer 78, and a pair of positlve electrodea 80 which are electrically connected to -a metal layer 82 carried on the inner, outer and end sur-~aces of a ~errite tube 84. The lower-illustrated rilter ; structure lncludes positive electrodes 86 which are smaller in area than the electrodes 80. There~ore, it is apparent that the positive electrodes may di~er in area for each ~ pin contact, which accordingly varies capacitances and ~iltering characteristicæ for each pin contact. With this structure, a variety o~ predetermined ~iltering values may be provided within the multi-~ilter structure without an ~ :
--6_ .
-:
. : . -~1~115 increase in manu~acturing costs.
FIGURES 4 and 5 illustrate typical patterns for the ground and pin electrodes, respectively. The electrical interconnections of the ground electrodes have not been illustrated in that a variety o~ connections may be utilized.
It is, however, o~ interest that a metal layer 8~ is pro-vided on a substrate o~ ceramic material of suitable dielectric constant. The pattern is provided such that holes 92 for receiving the metalized ferrite tubes are electrically isolated from the ground electrode 83 by way of gaps 90. In FIGURE 5 the difference in area of the posi-tive electrodes i8 illustrated. A positive electrode 94 is carried on a dielectric substrate and includes a hole 96 therethrough ~or receiving a metalized ~errite tube. An adjacent similar electrode 98 is similarly constructed and has a smaller capacitive plate area. Likewise, a positive electrode lO0 18 illustrated as having a still smaller area. ~here~oreJ the pin contacts associa~ed with the capacitors which comprise the plate~ 94, 98 and 100 will be provided with correspondlngly different rilter character-istics In the foregoing, a pi filter ~or a pin contact which i8 removable in the field has been disclosed. It is po8sible, and advantageous in certain applications, that the pin contacts not be removable. Such a structure and its method o~ fabrication is illustrated in FIGURES
6-g. FIGURE 6 illustrates a tubular ~errite ~ube 102 which has been metalized over each end and over pcrtions of the inner and outer surfaces adjacent each end as indi-cated at 104 and 106. FIGURE 7 illustrates a two layer struoture 108 having a ground electrode 110 with a peripheral metal layer 112 for connection to the metal shell of the oonnector assembly. The ground electrode 110 and a pair of _ . .
- positive electrodes 116 and 118 are carried by dielectric material 11~, the elements being formed into a unitary structure in substantially the same malmer discussed above with respect to FIGURES 1 and 2. It should be noted, how-ever, that the electrode 116 extends as far forward as the metal layer 112 and that, therefore, the electrode 116 must be insulated ~rom the connector shell if contact is to be made in a manner similar to that illustrated in FIGURES
1 and 2. An insulating disc inset into the elastomer disc 30 may be used. Also, the layer 112 may extend about the forward face of the structure~ insulated from the electrode 116, for better electrical contact with the elastomer disc 30.
The dielectric material 114 in FIGURE 7 inClUdes a bore 120 for receiving the metalized ferrite tube illu9-trated in FIGURE 6. The assembled structure is illuætrated in FIGURE 8. It will be appreciated that in this partiall~
' a8sembled ~tate the P08itive electrodes 116 and 118 contact ;~ the respective metalizations 104 and 106 carried b~ the ferrite tube 102. Here again, a gap 107 electrically 1BO-late8 the capacitors formed by the electrodes 116 and 118 with the electrode 110. Next, a pin contact 122 is inserted a deslred distance through the ferrite tube and contacts portions o~ the metalizations 104 and 106 at the ends and interior 8urface of the tube. In a rinal rabrication step, the pin contact 122 is solder bonded or fused to the --;~ metallzation8 104 and 106 and to the positive electrodes '~ ~ 116~and 118 in a sing1e heating operation, the bond bèing illu~trated at 124 and 126, FIGURE 10 schematically illustrates an equivalent ~clrcuit o~ a pi filter oonstructed in accordance with the ~j ~ present invention in which a pair o~ capacitors 128 and 1~0 :: .
haYe~terminals commonly connected at 1~2 to ground. me other~termlnals~ o~ the oapacitors 128 and 1~0 are connected :
in series with an inductance 136 and a resistance 138 constituted by a tubular ferrite member 134.
Conventional techniques have been utilized in providing the structures discussed above. For example the ferrite tube is metalized by emersion in a graphite solution to obtain surface conductivity. The appropriate parts aré then electroplated with, for example, a tin-lead alloy (a barrel process). A ring of resist is applied to the outer surface to provide the insulation gap required ~or separation of the capacitors.
Although the invention has been described by reference to particular illustrative embodiments thereof, many change~ and modifications o~ the invention may become apparent to those skilled in the art without departing from the spirit and scope of the invention. It is there-fore intended to include wlthin the patent warranted hereon all such changes and modifications as may reasonably and properly be included within the scope of the contributlon to the art, ' _9_ ` :
A more specific object of the invention is to provide a pi filter of simple structure, which is easily constructed, requires a minimum of handling in the overall assembly procedure, and which can be economically produced.
According to the invention, the pi filter comprises a pair o~ capacitances which are somewhat similar in nature to the capacitance~ disclosed in prior art. The two capaci-tances have their grourid electrodes connected in common and to the metal shell of the electrical connector, while their other electrodes, hereinafter called positi~e elec-trodes, are connected in two groups, with each group con-nected to opposite areas of a ~errite tube. ~he rerrlte tube receive~ a pin contact therein and carries a metaliza-tion at least partially on its inner surface and over two spaced areas of its outer ~urface by which the two groups of po~itive electrodes are connected to the pin contact.
An eleotrical connector a~embly constructed in a¢cordance with the pre~cnt invention compri~es a metal c~nnector ~hell which carries a dielectric member therein.
The dieleotric member includes a contact passageway there-through for receiving and mounting a pin contact. A
;i~ hollow tubular inductance, in the form of a ferrite tube~
i~ provided rOr receiving the pin contact therethrough.
The ferrite tube has an inner electrical contact area on I the inner sur~ace which i~ electrically connected to the i pin contact, by a spring contact, by soldering, fusing or ~o the like, and at least one outer contact area on the outer sur~ace which is electrically connected to the inner elec-trlcal contact area. ~he inner and outer electrical con-tacts area are advantageously constituted by a metalization ,. . . .
, . - . : . ~ . : . ' - ' 1~111~5 carried by the ~errite tube. A plurality o~ planar capaci-tor ground plates are spaced apart and connected in common to the metal connector shell, while another plurality o~
capacitor plates, the positive plates, extend between and spaced ~rom ground plates and are electrically connectcd to the metalization over the outer contact area of the ferrite tube.
More speci~ically, an electrical connector assem-bly constructed in accordance with the present invention comprises a metal connector shell and a dielectric mounted wlthin the shell. The dielectric is commonly termed a dielectric insert and includes a plurality of passageways therethrough which extend spaced apart parallel to the longitudinal axis of the connector assembly. A plurality o~ elongate pin contacts extend through respective ones o~
the contact passageways and are received in respective ferrite tu~es. The ~errite tubes each include spaced ends, an lnner surface and an outer surface and each carries at least one metallic layer which extends over spaced areas of the outer surface, over the ends and over at least spaced areas o~ the inner sur~ace. The metallic layer i~ electri-cally connected to the respective pin oontact either at the ends o~ the ferrite tube or by means o~ a spring contact carried by the pin contact. Each pin contact and its associated ferrite tube i8 provided with a pair of capacitors.
The ground electrodes of both o~ the capacitors are con-nected in common and further connected to the metal connec-tor shell. m e po~itive electrodes of one capacitor of the pair of capacitors are connec~ed together and connected 3 to the metallic layer carried over one area o~ the outer sur~ace of the ~errite tube. Similarly, the positive i electrodes Or the other capacitor o~ this pair o~ capacitors ~ are connected in common to the metallic layer over the other ':
i. . . .
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S
area of the outer surface of the ferrite tube. Thus, the two capacitors and the ferrite tube constitute a pi filter for the pin contact which extends through the tube, Advantageously, the metallic layers which constitute the plates of the capaeitors may have different plate areas and thus provide different capacitances, and thus different filter characteristics, for the respective pin contacts, The invention is particularly directed toward an electrical connector assembly having a metal connector shell aDd a dielectrie member carried in the shell, The dielectric member includes at least one contact passageway extending therethrough, An electrical contact is mounted in the passageway. A hollow tubular inductance member is provided having an inner surface and an outer surface, The electrical eontaet extends through the hollow tubular inductance member.
An inner eleetrieal eontaet area on the inner surfaee of the induetanee member is electrically eonnected to the electrical eontaet, and at least one outer contact area on the outer sur~ace is eleetrieally eonneeted to the inner electrieal eontaet area, A plurality of radlally extending ~irst planar eapaeitor plates are spaeed apart and eleetrieally eonneeted to the outer eontaet area; and a plurality of radially extend-ing seeond eapaeitor plates extend between and are spaeed ~rom the first eapaeitor plates, The seeond plates are eleetrieally eonneeted to the metal eonneetor shell, The first eapaeitor plates, the seeond eapaeitor plates and the indue-tanee member eonstitute a filter, Other objeets, features and advantages of the inven-tion, its organization, eonstruetion and operation will be best understood from the following detailed deseription taken in eonjunetion with the aeeompanying drawings, on whieh:
i FIGURE 1 is an enlarged isometrie view, shown _3_ ' partially in section, of an electrical connector assembly constructed in accordance with the invention; -~
FIGURE 2 is a greatly enlarged sectional view of a pi filter constructed in accordance with the present invention;
FIGURE 3 is a schematic illustration of two pi filters having different filtering characteristics due to different sizes of capacitor plates;
FIGURE 4 schematically illustrates a typical ground electrode pattern which may be utilized in practicing the present invention;
FIGURE 5 schematically illustrates a typical pin or ;:
positive electrode pattern which may be utilized in practicing the present invention;
FIGURES 6-9 schematically illustrate, in sectional elevation, a pi filter of the present invention having a non-removable pin contact and the method of fabricating the pi filter; and FIGURE 10 is an electrical schematic circuit . .
:" ' -.
" ' ~r~ -3a- ~
' ' .. .. . . . . . . . .
: - . :. - ~ - . :
diagram o~ a pi filter attained by practicing the present invention.
Re~erring to FIGURE 1, a pin contact connector assembly is illustrated and generally referenced 10. The connector assembl~ 10 comprises a generally annular metal shell 12 having a ~ront end 14 for telescoping engagement with the shell of a mating connector (not shown) to electri-cally connect pin contacts, such as 16, in the shell 12 with the receptacle contacts of the mating connector under 10 a desired axial pressure. ~-The pin contacts 16 are each received in a respeotive contact receiving pasæageway 18 o~ a rear di-electric retention insert 20 which is secured in the shell 12, Ea¢h contact passes through a respective aligned passageway 21 in a dielectric disc 22, an aligned passage-way 23 in a silicone rubber cushion or disc 24 and then extends through a respective aligned passageway 26 in a filter assembly 28. The pin contact 16 further extends ~-through an aligned passageway 29 in a conductive elastomer or disc 30 and pro~ects through an aligned passag~way 31 in a ~ront dieleotrio insert 32 which is seoured ln the shell 12 to enable the engagement of the pin oontact with the re¢eptacle contaot o~ a mating connector.
The dieleotric retention insert 20 is provided with oonventional retention tines 34 which extend into eaoh pas~ageway 18 for engagement behind the rear radial ~aoe of an enlarged diameter portion or shoulder ~6 on the oontact '~ 16 to prevent retraction unless the ~ingers ~4 are spread by a suitable tool. The ~ront radial ~ace o~ the shoulder 36 engages the rear ~ace or projection ~8 o~ the dielectric ; disc 22 to limit forward movement o~ the contact 16. A
oonductor (not shown) is seoured to the rear end of each contact to provide an electrical connecltion therewith, and L~ ~:
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a conventional grommet (also not shown) is secured to the shell 12 to protect the connection.
As best illustrated in FIGURE 2, the filter as-sembly 28g more specifically a pi filter assembly, is illus-trated as comprising a plurality of ceramic discs 40 of a suitably high dielectric constant which are bonded together to form an integral structure. An intermediate ceramic disc 46 is provided in the integral structure as an element which aids in de~ining two separate capacitors, as will become apparent ~rom the description below. The integral structure includes a pl~rality o~ radially extending metal capacltor plates 42 and 44 in alternate axially spaced positions, the plates 44 constituting the ground electrodes and the plates 42 constituting the positive electrodes.
; All of the ground electrodes 44 are connected in common by a peripheral metal layer 48. The metal layer 48 may con-tact the metal shell 12~ however, a more positive grounding contact occurs ~hrough the engagement of the ~orwardmost plate 44 with the rearward radial face of the conductive elastomer disc ~0.
The ~orward posltlve capacitor plates 42 have been more speclfically referenced 42a, while the remaining, rearward, positive plates have been referenced more specifi-cally as 42b. The filter ~tructure is provided with a metal layer 50 which is electrically connected to the electrodes 42a, and with a metal layer 52 which is electri-cally connected to the electrodes 42b. The metal layers 50 -and 52 there~ore de~ine separate terminals for separate ; capacltors, while the metal layer 48 defines a common termi-~0 nal ~or both capacitors.
The capacitor structure receives a ~errite tube 56 therein, the ferrite tube carrying a metal layer having a portion 58 which extends over the inner sur~ace of the !
.
- ~ . . .
~11115 tube, portions 60 and 62 which extend over the ends of the ferrite tube, and portions 54 and 66 which extend over spaced areas of the outer sur~ace of the ferrite tube~
The metal layer portion 66 is electrically connected, such as by fusing, to the metal layer 50, while the layer portion 64 is electrically connected to the metal layer 52. A
gap 54 defines a separation between the two capacitors on the outer surface o~ the ~errite tube 56. .
Advantageously, the above structure requires only a single electrical connection to the pin contact 16.
In FIGURE 2, this single contact is provided by way of a spring contact 68 which is recelved in a reduced d~ameter portion of the pln contact 16 so as to abut a ~orward shoulder 70 and a rear shoulder 72. A similar structure is illustrated in FIGURE 1 where a spring contact 69 is provided on a reduced diameter portion of the pin contact 16 to abut a forward shoulder 71 and bear against an out-wardly tapering portion 73.
Referring to FIGURE 3, a schematic cross sectional representatlon o~ a typical three layer pi filter i8 lllus-trated ~or two pin contact holes. The three layers of ceramlc dlelectric material 74 carry ground electrodes 76 which are interconnected by a metal layer 78, and a pair of positlve electrodea 80 which are electrically connected to -a metal layer 82 carried on the inner, outer and end sur-~aces of a ~errite tube 84. The lower-illustrated rilter ; structure lncludes positive electrodes 86 which are smaller in area than the electrodes 80. There~ore, it is apparent that the positive electrodes may di~er in area for each ~ pin contact, which accordingly varies capacitances and ~iltering characteristicæ for each pin contact. With this structure, a variety o~ predetermined ~iltering values may be provided within the multi-~ilter structure without an ~ :
--6_ .
-:
. : . -~1~115 increase in manu~acturing costs.
FIGURES 4 and 5 illustrate typical patterns for the ground and pin electrodes, respectively. The electrical interconnections of the ground electrodes have not been illustrated in that a variety o~ connections may be utilized.
It is, however, o~ interest that a metal layer 8~ is pro-vided on a substrate o~ ceramic material of suitable dielectric constant. The pattern is provided such that holes 92 for receiving the metalized ferrite tubes are electrically isolated from the ground electrode 83 by way of gaps 90. In FIGURE 5 the difference in area of the posi-tive electrodes i8 illustrated. A positive electrode 94 is carried on a dielectric substrate and includes a hole 96 therethrough ~or receiving a metalized ~errite tube. An adjacent similar electrode 98 is similarly constructed and has a smaller capacitive plate area. Likewise, a positive electrode lO0 18 illustrated as having a still smaller area. ~here~oreJ the pin contacts associa~ed with the capacitors which comprise the plate~ 94, 98 and 100 will be provided with correspondlngly different rilter character-istics In the foregoing, a pi filter ~or a pin contact which i8 removable in the field has been disclosed. It is po8sible, and advantageous in certain applications, that the pin contacts not be removable. Such a structure and its method o~ fabrication is illustrated in FIGURES
6-g. FIGURE 6 illustrates a tubular ~errite ~ube 102 which has been metalized over each end and over pcrtions of the inner and outer surfaces adjacent each end as indi-cated at 104 and 106. FIGURE 7 illustrates a two layer struoture 108 having a ground electrode 110 with a peripheral metal layer 112 for connection to the metal shell of the oonnector assembly. The ground electrode 110 and a pair of _ . .
- positive electrodes 116 and 118 are carried by dielectric material 11~, the elements being formed into a unitary structure in substantially the same malmer discussed above with respect to FIGURES 1 and 2. It should be noted, how-ever, that the electrode 116 extends as far forward as the metal layer 112 and that, therefore, the electrode 116 must be insulated ~rom the connector shell if contact is to be made in a manner similar to that illustrated in FIGURES
1 and 2. An insulating disc inset into the elastomer disc 30 may be used. Also, the layer 112 may extend about the forward face of the structure~ insulated from the electrode 116, for better electrical contact with the elastomer disc 30.
The dielectric material 114 in FIGURE 7 inClUdes a bore 120 for receiving the metalized ferrite tube illu9-trated in FIGURE 6. The assembled structure is illuætrated in FIGURE 8. It will be appreciated that in this partiall~
' a8sembled ~tate the P08itive electrodes 116 and 118 contact ;~ the respective metalizations 104 and 106 carried b~ the ferrite tube 102. Here again, a gap 107 electrically 1BO-late8 the capacitors formed by the electrodes 116 and 118 with the electrode 110. Next, a pin contact 122 is inserted a deslred distance through the ferrite tube and contacts portions o~ the metalizations 104 and 106 at the ends and interior 8urface of the tube. In a rinal rabrication step, the pin contact 122 is solder bonded or fused to the --;~ metallzation8 104 and 106 and to the positive electrodes '~ ~ 116~and 118 in a sing1e heating operation, the bond bèing illu~trated at 124 and 126, FIGURE 10 schematically illustrates an equivalent ~clrcuit o~ a pi filter oonstructed in accordance with the ~j ~ present invention in which a pair o~ capacitors 128 and 1~0 :: .
haYe~terminals commonly connected at 1~2 to ground. me other~termlnals~ o~ the oapacitors 128 and 1~0 are connected :
in series with an inductance 136 and a resistance 138 constituted by a tubular ferrite member 134.
Conventional techniques have been utilized in providing the structures discussed above. For example the ferrite tube is metalized by emersion in a graphite solution to obtain surface conductivity. The appropriate parts aré then electroplated with, for example, a tin-lead alloy (a barrel process). A ring of resist is applied to the outer surface to provide the insulation gap required ~or separation of the capacitors.
Although the invention has been described by reference to particular illustrative embodiments thereof, many change~ and modifications o~ the invention may become apparent to those skilled in the art without departing from the spirit and scope of the invention. It is there-fore intended to include wlthin the patent warranted hereon all such changes and modifications as may reasonably and properly be included within the scope of the contributlon to the art, ' _9_ ` :
Claims (14)
1. An electrical connector assembly comprising: a metal connector shell, a dielectric member carried in said shell, said dielectric member including at least one contact passageway extending therethrough; an electrical contact mounted in said passageway; a hollow tubular inductance member having an inner surface and an outer surface, said electrical contact extending through said hollow tubular inductance member, an inner electri-cal contact area on said inner surface electrically connected to said electrical contact, and at least one outer contact area on said outer surface electrically connected to said inner electrical contact area; a plurality of radially extending first planar capacitor plates spaced apart and electrically connected to said outer contact area; and a plurality of radially extend-ing second capacitor plates extending between and spaced from said first capacitor plates, said second plates electrically connected to said metal connector shell, said first capacitor plates, said second capacitor plates and said inductance member constituting a filter.
2. The electrical connector assembly of claim 1, wherein said outer surface of said tubular inductance member includes a pair of spaced outer contact areas each electrically connected to separate groups of said first capacitor plates to form a pi filter.
3. The electrical connector assembly of claim 1, wherein said inductance member comprises an elongate tubular member of ferrite material.
4. An electrical connector assembly comprising: a metal connector shell; a dielectric member carried in said shell and including at least one contact passageway extending there-through; an electrical contact extending through and mounted in said passageway; a hollow inductance within said shell surroun-ding and electrically connected to said electrical contact; said inductance including an inner contact area engaging said elec-trical contact and outer contact areas electrically connected to said inner contact area; and a pair of planar capacitances each including radially extending plates surrounding said induc-tance, each said capacitance electrically connected between a respective outer contact area of said inductance and said shell to form a pi filter.
5. An electrical connector assembly comprising: a metal connector shell; a dielectric mounted in said shell and including at least one passageway extending axially therethrough;
an electrical contact mounted in said passageway; an inductance within said metal connector shell, said inductance comprising a tubular ferrite member including an inner surface and an outer surface, and a metallic layer carried on said inner surface and extending over the ends of said member and over spaced areas of said outer surface, said electrical contact extending through said ferrite member and electrically connected to said metallic layer; and a pair of capacitors forming a pi filter with said inductance, each of said capacitors comprising a plurality of radially extending spaced first plates electrically connected to said metallic layer over a respective spaced area of said outer surface of said ferrite member, and a plurality of radi-ally extending second plates spaced from respective ones of said first plates and electrically connected to said shell.
an electrical contact mounted in said passageway; an inductance within said metal connector shell, said inductance comprising a tubular ferrite member including an inner surface and an outer surface, and a metallic layer carried on said inner surface and extending over the ends of said member and over spaced areas of said outer surface, said electrical contact extending through said ferrite member and electrically connected to said metallic layer; and a pair of capacitors forming a pi filter with said inductance, each of said capacitors comprising a plurality of radially extending spaced first plates electrically connected to said metallic layer over a respective spaced area of said outer surface of said ferrite member, and a plurality of radi-ally extending second plates spaced from respective ones of said first plates and electrically connected to said shell.
6. The electrical connector assembly of claim 5, comprising a spring contact element carried on said electrical contact to engage the metallic layer and provide] an electrical connection therebetween.
7. The electrical connector assembly of claim 5, comprising a solder connection between said electrical contact and said metallic layer,
8. An electrical connector assembly comprising: a metallic connector shell, a dielectric insert mounted in said shell and including at least one contact passageway extending axially therethrough; an elongate electrical contact mounted in and extending through said contact passageway; a ferrite tube about a portion of said elongate electrical contact, said tube having spaced ends, an inner surface and an outer surface; a metallic layer carried on said ferrite tube and extending between spaced areas of said outer surface via said ends and said inner surface said metallic layer electrically connected to said elon-gate electrical contact; and a pair of capacitors, each of said capacitors comprising a plurality of radially extending capaci-tor plates, dielectric material between said capacitor plates, and an annular metallic layer carried on the dielectric material about said ferrite tube and electrically connecting some of said capacitor plates to said metallic layer over a respective one of said spaced areas, and a common annular metallic layer carried by said dielectric material of each of said capacitors and electrically connecting others of said capacitor plates to said metal connector shell.
9. The electrical connector assembly of claim 8, comprising a resilient spring contact element carried on said electrical contact and engaging said metallic layer on said inner surface of said ferrite tube.
10. The electrical connector assembly of claim 8, comprising: an electrical bond connecting said metallic layer and said electrical contact.
11. In an electrical connector assembly of the type wherein an elongate electrical contact is mounted in a contact passageway of a dielectric insert which is carried in a hollow metal connector shell and a pair of planar type capacitors.
having radially extending plates are mounted in the shell and electrically connected as filter elements, between the electri-cal contact and the shell, the improvement therein comprising:
a tubular ferrite member disposed about the electrical contact and electrically connected to the contact and the capacitor, said tubular ferrite member including an inner contact area engaging said electrical contact and a pair of outer contact areas electrically connected to said inner contact area and to respective ones of said planar type capacitors.
having radially extending plates are mounted in the shell and electrically connected as filter elements, between the electri-cal contact and the shell, the improvement therein comprising:
a tubular ferrite member disposed about the electrical contact and electrically connected to the contact and the capacitor, said tubular ferrite member including an inner contact area engaging said electrical contact and a pair of outer contact areas electrically connected to said inner contact area and to respective ones of said planar type capacitors.
12. In an electrical connector assembly of the type wherein an elongate electrical contact is mounted in a contact passageway of a dielectric insert which is carried in a hollow metal connector shell and a pair of planar type capacitors hav-ing radially extending plates are mounted in the shell and electrically connected as a filter between the electrical con-tact and the shell, the improvement therein comprising: a tubu-lar ferrite member disposed about the electrical contact; and a metallic layer carried on said ferrite member and contacting the pair of capacitors and the electrical contact at spaced points to form a pi filter.
13. An electrical connector assembly comprising: a metallic connector shell; a dielectric insert mounted in said shell and having a longitudinal axis, said dielectric insert including a plurality of passageways therethrough extending spaced apart parallel to said longitudinal axis; a plurality of elongate electrical contacts, each of said electrical contacts-including an active portion at one end for engaging a comple-mentary contact of a mating electrical connector, a conductor-receiving portion at the other end or connection to an electri-cal conductor and a portion intermediate said active and con-ductor receiving portions, said intermediate portion mounted in a respective passageway of said dielectric insert; a plurality of ferrite tubes each surrounding a respective electrical con-tact and including spaced ends, an inner surface, and an outer surface, and at least one metallic layer carried by said respec-tive ferrite tube and extending over spaced areas of said outer surface, over said ends and over at least spaced areas of said inner surface, said metallic layer on the inner surface electri-cally connected to the respective electrical contact; a plural-ity of pairs of capacitors, each pair of capacitors associated with a respective ferrite tube, each capacitor of a pair of capacitors comprising a plurality of planar, radially extending, spaced capacitor plates, first ones of said capacitor plates electrically connected to said metal connector shell and second ones of said capacitor plates electrically connected to said metallic layer over a respective one of said spaced areas, each pair of capacitors and the associated ferrite tube constituting a pi filter for the electrical contact which extends through that ferrite tube,
14, An electrical connector assembly, comprising: a metal connector shell; a dielectric insert mounted in said shell and having a longitudinal axis, said dielectric insert including a plurality of passageways therethrough spaced apart and exten-ding parallel to said longitudinal axis; a plurality of elongate electrical contacts, each of said contacts including an active portion at one end for engaging a complementary contact of a mating electrical connector, a conductor-receiving portion at the other end for connection to an electrical conductor, and a portion intermediate said active and conductor-receiving portions, said intermediate portion mounted in a respective passageway of said dielectric insert; a plurality of ferrite tubes each cir-cumscribing a respective contact and including spaced ends, an inner surface and an outer surface, and at least one metallic layer carried by said respective ferrite tube and extending over spaced areas of said outer surface, over said ends and over at least spaced areas of said inner surface, said metallic layer electrically connected to the respective electrical contact;
and a plurality of capacitors, each pair of capacitors associa-ted with a respective ferrite tube, each capacitor of a pair of capacitors comprising: a plurality of dielectric discs; a plurality of radially extending metallic layer capacitor plates carried on respective ones of said discs, first ones of said capacitor plates electrically connected to said metal connector shell and second ones of said capacitor plates electrically connected to said metallic layer of the respective ferrite tube over a respective one of said spaced areas, each pair of capa-citors and the associated ferrite tube constituting a pi filter for the electrical contact which extends through that ferrite tube, the metallic layer capacitor plates having differing areas providing differing filter characteristics.
and a plurality of capacitors, each pair of capacitors associa-ted with a respective ferrite tube, each capacitor of a pair of capacitors comprising: a plurality of dielectric discs; a plurality of radially extending metallic layer capacitor plates carried on respective ones of said discs, first ones of said capacitor plates electrically connected to said metal connector shell and second ones of said capacitor plates electrically connected to said metallic layer of the respective ferrite tube over a respective one of said spaced areas, each pair of capa-citors and the associated ferrite tube constituting a pi filter for the electrical contact which extends through that ferrite tube, the metallic layer capacitor plates having differing areas providing differing filter characteristics.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US731,125 | 1976-10-12 | ||
| US05/731,125 US4083022A (en) | 1976-10-12 | 1976-10-12 | Planar pi multi-filter having a ferrite inductance for pin filters in electrical connectors |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1111115A true CA1111115A (en) | 1981-10-20 |
Family
ID=24938173
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA288,504A Expired CA1111115A (en) | 1976-10-12 | 1977-10-07 | Planar pi multi-filter having a ferrite inductance for pin filters in electrical connectors |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US4083022A (en) |
| JP (1) | JPS5359881A (en) |
| BR (1) | BR7706579A (en) |
| CA (1) | CA1111115A (en) |
| DE (1) | DE2745027A1 (en) |
| GB (1) | GB1585377A (en) |
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|---|---|---|---|---|
| US4144509A (en) * | 1977-01-12 | 1979-03-13 | Bunker Ramo Corporation | Filter connector |
| US4176348A (en) * | 1978-03-30 | 1979-11-27 | Coded Communications | Electronic security device |
| FR2422268A1 (en) * | 1978-04-06 | 1979-11-02 | Eurofarad | HF electrical connector with integral capacitor filters - has contact pins with staggered metal plates forming capacitors and overall ceramic enclosure |
| US4371226A (en) * | 1980-10-20 | 1983-02-01 | International Telephone And Telegraph Corporation | Filter connector and method of assembly thereof |
| US4401355A (en) * | 1981-07-01 | 1983-08-30 | Rca Corporation | Filtered connector |
| US4494092A (en) * | 1982-07-12 | 1985-01-15 | The Deutsch Company Electronic Components Division | Filter pin electrical connector |
| US4600262A (en) * | 1983-03-29 | 1986-07-15 | International Telephone & Telegraph Corp. | Electrical connector embodying electrical circuit components |
| US4791391A (en) * | 1983-03-30 | 1988-12-13 | E. I. Du Pont De Nemours And Company | Planar filter connector having thick film capacitors |
| US4589720A (en) * | 1983-07-20 | 1986-05-20 | Northern Telecom Limited | Planar electronic filter element and a connector embodying such a filter |
| US4648681A (en) * | 1984-12-20 | 1987-03-10 | Amp Incorporated | Filtered electrical plug |
| US4695105A (en) * | 1984-12-20 | 1987-09-22 | Amp Incorporated | Filtered electrical receptacle |
| US4572600A (en) * | 1985-02-28 | 1986-02-25 | Itt Corporation | Electrical connector for transient suppression |
| US4690479A (en) * | 1985-10-10 | 1987-09-01 | Amp Incorporated | Filtered electrical header assembly |
| GB8610665D0 (en) * | 1986-05-01 | 1986-06-04 | Oxley Dev Co Ltd | Filtered electrical connectors |
| US4741710A (en) * | 1986-11-03 | 1988-05-03 | Amphenol Corporation | Electrical connector having a monolithic capacitor |
| US4992061A (en) * | 1989-07-28 | 1991-02-12 | Thomas & Betts Corporation | Electrical filter connector |
| US4930200A (en) * | 1989-07-28 | 1990-06-05 | Thomas & Betts Corporation | Method of making an electrical filter connector |
| US5153540A (en) * | 1991-04-01 | 1992-10-06 | Amphenol Corporation | Capacitor array utilizing a substrate and discoidal capacitors |
| US5287076A (en) * | 1991-05-29 | 1994-02-15 | Amphenol Corporation | Discoidal array for filter connectors |
| WO1993008622A1 (en) * | 1991-10-17 | 1993-04-29 | Itt Industries, Inc. | Connector with interchangeable contacts |
| US5701665A (en) * | 1993-01-19 | 1997-12-30 | The Whitaker Corporation | Pi signal frequency filter method of manufacture |
| US5333095A (en) * | 1993-05-03 | 1994-07-26 | Maxwell Laboratories, Inc., Sierra Capacitor Filter Division | Feedthrough filter capacitor assembly for human implant |
| GB9406934D0 (en) * | 1994-04-07 | 1994-06-01 | Amp Gmbh | Electrial terminal back-up spring with anti-chattering support members |
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| AU3299995A (en) * | 1994-10-04 | 1996-04-18 | Medtronic, Inc. | Protective feedthrough |
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| US5870272A (en) * | 1997-05-06 | 1999-02-09 | Medtronic Inc. | Capacitive filter feedthrough for implantable medical device |
| JP3269434B2 (en) * | 1997-09-05 | 2002-03-25 | 株式会社村田製作所 | Electronic components |
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| DE19820686C2 (en) * | 1998-05-08 | 2002-01-24 | Siemens Ag | Filter plug device with a holding plate having at least one earth potential surface |
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| GB0128847D0 (en) * | 2001-12-01 | 2002-01-23 | Oxley Dev Co Ltd | Monolithic capacitor array & electrical connector |
| EP1488434B1 (en) * | 2002-02-28 | 2012-12-12 | Greatbatch Ltd. | Emi feedthrough filter terminal assembly utilizing hermetic seal for electrical attachment between lead wires and capacitor |
| US6985347B2 (en) * | 2002-02-28 | 2006-01-10 | Greatbatch-Sierra, Inc. | EMI filter capacitors designed for direct body fluid exposure |
| US6999818B2 (en) * | 2003-05-23 | 2006-02-14 | Greatbatch-Sierra, Inc. | Inductor capacitor EMI filter for human implant applications |
| US7038900B2 (en) * | 2003-02-27 | 2006-05-02 | Greatbatch-Sierra, Inc. | EMI filter terminal assembly with wire bond pads for human implant applications |
| US7623335B2 (en) * | 2003-02-27 | 2009-11-24 | Greatbatch-Sierra, Inc | Hermetic feedthrough terminal assembly with wire bond pads for human implant applications |
| US7765005B2 (en) * | 2004-02-12 | 2010-07-27 | Greatbatch Ltd. | Apparatus and process for reducing the susceptability of active implantable medical devices to medical procedures such as magnetic resonance imaging |
| US7035077B2 (en) * | 2004-05-10 | 2006-04-25 | Greatbatch-Sierra, Inc. | Device to protect an active implantable medical device feedthrough capacitor from stray laser weld strikes, and related manufacturing process |
| ES2313165T3 (en) * | 2005-08-12 | 2009-03-01 | 3M Innovative Properties Company | TELECOMMUNICATIONS CONNECTOR. |
| US7278887B1 (en) * | 2006-05-30 | 2007-10-09 | John Mezzalingua Associates, Inc. | Integrated filter connector |
| JP5494381B2 (en) * | 2010-09-14 | 2014-05-14 | 住友電装株式会社 | connector |
| EP3634571B1 (en) * | 2017-06-09 | 2023-04-19 | Medtronic, Inc. | Feedthrough assembly including ferrule with tapered extension(s) |
| US10874865B2 (en) | 2017-11-06 | 2020-12-29 | Avx Corporation | EMI feedthrough filter terminal assembly containing a resin coating over a hermetically sealing material |
| GB2574653B (en) * | 2018-06-14 | 2020-09-09 | Knowles (Uk) Ltd | Capacitor having an electrical termination |
| RU2711149C1 (en) * | 2019-01-10 | 2020-01-15 | Российская Федерация, от имени которой выступает Государственная корпорация по атомной энергии "Росатом" | Device for protection and switching of fuse |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3456215A (en) * | 1964-09-02 | 1969-07-15 | Peter A Denes | High frequency low pass filter |
| US3548347A (en) * | 1968-02-16 | 1970-12-15 | Sprague Electric Co | Filter unit having monolithic capacitor |
-
1976
- 1976-10-12 US US05/731,125 patent/US4083022A/en not_active Expired - Lifetime
-
1977
- 1977-10-03 BR BR7706579A patent/BR7706579A/en unknown
- 1977-10-04 GB GB41263/77A patent/GB1585377A/en not_active Expired
- 1977-10-06 DE DE19772745027 patent/DE2745027A1/en not_active Withdrawn
- 1977-10-07 CA CA288,504A patent/CA1111115A/en not_active Expired
- 1977-10-11 JP JP12101577A patent/JPS5359881A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| BR7706579A (en) | 1978-08-22 |
| US4083022A (en) | 1978-04-04 |
| DE2745027A1 (en) | 1978-04-13 |
| JPS5359881A (en) | 1978-05-30 |
| GB1585377A (en) | 1981-03-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry | ||
| MKEX | Expiry |
Effective date: 19981020 |