CA1040583A - Metallized video disc having a dielectric coating thereon and method of hardening the same - Google Patents
Metallized video disc having a dielectric coating thereon and method of hardening the sameInfo
- Publication number
- CA1040583A CA1040583A CA218,638A CA218638A CA1040583A CA 1040583 A CA1040583 A CA 1040583A CA 218638 A CA218638 A CA 218638A CA 1040583 A CA1040583 A CA 1040583A
- Authority
- CA
- Canada
- Prior art keywords
- coating
- disc
- xylylene
- dielectric coating
- poly
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/62—Plasma-deposition of organic layers
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B9/00—Recording or reproducing using a method not covered by one of the main groups G11B3/00 - G11B7/00; Record carriers therefor
- G11B9/06—Recording or reproducing using a method not covered by one of the main groups G11B3/00 - G11B7/00; Record carriers therefor using record carriers having variable electrical capacitance; Record carriers therefor
- G11B9/061—Record carriers characterised by their structure or form or by the selection of the material; Apparatus or processes specially adapted for the manufacture of record carriers
- G11B9/063—Record carriers characterised by their structure or form or by the selection of the material; Apparatus or processes specially adapted for the manufacture of record carriers characterised by the selection of the material
- G11B9/067—Dielectric layers; Processes for providing electrical conductivity to them
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
- Y10T428/24521—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness with component conforming to contour of nonplanar surface
- Y10T428/24537—Parallel ribs and/or grooves
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31678—Of metal
- Y10T428/31692—Next to addition polymer from unsaturated monomers
- Y10T428/31699—Ester, halide or nitrile of addition polymer
Abstract
METALLIZED VIDEO DISC HAVING A
DIELECTRIC COATING THEREON AND
METHOD OF HARDENING THE SAME
Abstract Poly-p-xylylene is utilized for a thin conformal dielectric coating on metallized discs. The poly-p-xylylene coating is deposited by vapor deposition and then hardened by exposure to a glow discharge. A method of hardening a polymeric dielectric coating by exposure to a glow discharge after the coating has been deposited on the disc.
DIELECTRIC COATING THEREON AND
METHOD OF HARDENING THE SAME
Abstract Poly-p-xylylene is utilized for a thin conformal dielectric coating on metallized discs. The poly-p-xylylene coating is deposited by vapor deposition and then hardened by exposure to a glow discharge. A method of hardening a polymeric dielectric coating by exposure to a glow discharge after the coating has been deposited on the disc.
Description
RCA 67502 ~
' ' '`;- " .:
~04L(~S~3 This invention relates to the manu-facture of video discs and particularly to manu-facturing a video disc having ; a durable dielectric coating thereon with excellent playback : 5 qualities. - -,'' ~ ", .
Recording and playback systems have been developed wherein a video disc is utilized to store information.
According to one method, conductive discs are prepared having geometric variations in the bottom of a spiral groove in the disc sur~ace which correspond to capacitance variations i re~resentative of the stored information. The conductive disc is obtalned by metallizing the surface of a vinyl disc. ~ ;
The conductive discs are then coated with a thin conformal dielectric coating. A stylus having a metallic elect~ode completes the capacitor, and, during playback, rides upon the dielectric coating, detecting the variations in the groove. These variations are reconstituted in electrical signal form and converted back to the stored information which can be viewed in a television monitor capable of displaying the stored audio and vi.sual in-formation.
--,.. .
The stylus is separated from the conductive -disc surface by the thin conformal dielectric coating. For quality recordings, it is necessary tha-t the dielectric coating meet very stringent requirements. For example, the most desirable dielectric coating would be uniform in thick-ness and composition, as well as conforming to the geometric 3 variations in the grooves, yet without faults or pinholes.
' ' '`;- " .:
~04L(~S~3 This invention relates to the manu-facture of video discs and particularly to manu-facturing a video disc having ; a durable dielectric coating thereon with excellent playback : 5 qualities. - -,'' ~ ", .
Recording and playback systems have been developed wherein a video disc is utilized to store information.
According to one method, conductive discs are prepared having geometric variations in the bottom of a spiral groove in the disc sur~ace which correspond to capacitance variations i re~resentative of the stored information. The conductive disc is obtalned by metallizing the surface of a vinyl disc. ~ ;
The conductive discs are then coated with a thin conformal dielectric coating. A stylus having a metallic elect~ode completes the capacitor, and, during playback, rides upon the dielectric coating, detecting the variations in the groove. These variations are reconstituted in electrical signal form and converted back to the stored information which can be viewed in a television monitor capable of displaying the stored audio and vi.sual in-formation.
--,.. .
The stylus is separated from the conductive -disc surface by the thin conformal dielectric coating. For quality recordings, it is necessary tha-t the dielectric coating meet very stringent requirements. For example, the most desirable dielectric coating would be uniform in thick-ness and composition, as well as conforming to the geometric 3 variations in the grooves, yet without faults or pinholes.
- 2 -, . , . ' ' . ' ' ' ~, ' ", . RCA 67,502 ." . .
~L~405~3 :
1 In addition, the dielectric coating must be strong enoughto withstand repeated passes of the stylus without damage to the coating itself or to the variations in the disc, yet the coating must not be so hard as to unduly wear the stylus.
5 Present discs employ polymers such as polystyrene for the -:
thin conformal dielectric coating. However, present dielec-tric coating techniques enhance the roughness of the surface .
of the metalli~ed disc causing the stylus to bounce off and back on the metallized surface. Furthermore, present 10 dielectric coatings have little elasticity thus causing ~-rapid wear of the stylus as well as eventual damage to the groove dimensions as the stylus bounces up and down along its spiral path. A conformal dielectric coating Oe poly-p-xylylene meets all but one of the stringent requirements;
the coating is too soft, being capable of providing only about lO0 plays of satisfactory quality.
In addition, after a polymeric dielectric coating has been applied to a disc by conventional means, e.g., vapor deposition, it is often necessary to further harden the coating without disturbing the structure of the disc.
Hardening a polymeric coating involves increasing the degree of crosslinking in the polymer as well as -the molecular weight of the polymer. The most common technique for hardening polymeric coatings, heating the coating, is unacceptable as the necessary temperature for hardening, about 2looF~ is too high for the vinyl disc to withstand without incurring structural defects. Another technique for hardening polymeric coatings, ultraviolet radiation, is not effective for all polymeric coatings.
~L~405~3 :
1 In addition, the dielectric coating must be strong enoughto withstand repeated passes of the stylus without damage to the coating itself or to the variations in the disc, yet the coating must not be so hard as to unduly wear the stylus.
5 Present discs employ polymers such as polystyrene for the -:
thin conformal dielectric coating. However, present dielec-tric coating techniques enhance the roughness of the surface .
of the metalli~ed disc causing the stylus to bounce off and back on the metallized surface. Furthermore, present 10 dielectric coatings have little elasticity thus causing ~-rapid wear of the stylus as well as eventual damage to the groove dimensions as the stylus bounces up and down along its spiral path. A conformal dielectric coating Oe poly-p-xylylene meets all but one of the stringent requirements;
the coating is too soft, being capable of providing only about lO0 plays of satisfactory quality.
In addition, after a polymeric dielectric coating has been applied to a disc by conventional means, e.g., vapor deposition, it is often necessary to further harden the coating without disturbing the structure of the disc.
Hardening a polymeric coating involves increasing the degree of crosslinking in the polymer as well as -the molecular weight of the polymer. The most common technique for hardening polymeric coatings, heating the coating, is unacceptable as the necessary temperature for hardening, about 2looF~ is too high for the vinyl disc to withstand without incurring structural defects. Another technique for hardening polymeric coatings, ultraviolet radiation, is not effective for all polymeric coatings.
3~ _ 3 _ , -RCA 67,5~2 ' :., '; ~.,',,,:
10~0583 !- ..
', "
A polymeric dielectric coating on the surface of a conductive disc is hardened by exposing the coating to a glow discharge after the coating has been deposited on the con-ductive disc. An improved information storage means of thetype having capacitance variations which can be displayed through a playback system. The information storage means includes a conductive disc having information recorded in the form of geometric variations in the surface thereof 10 with a thin conformal coating thereon of poly-p-xylylene. ;
The storage means is improved by hardening the coating by -;
glow discharge techniques.
....~ ' ' ' ' According to the presen-t invention, a metallized 15 vinyl disc, i.e., a conductive disc, having a spiral groove ;
therein can be coated with poly-p-xylylene, e.g., poly-p-chloro-xylylene. It is necessary, in order to successfully coat a surface with a truly linear poly-p-xylylene coating, to first cleave the cyclic dimer, di-p-xylylene, to obtain 20 the reactive vaporous radicals which are then condensed ~-upon the surface, wherein the radicals condense and polymerize to form a linear homopolymeric or copolymeric coating depending upon the initial choice of dimeric reactants, system pressure, and the temperature of the surface to be coated. The vapor :~
25 deposition takes place in apparatus similar to that described ;`
in U. S. patent No. 3,246,627 entitled, 'IApparatus For Vapor Depositlon,!~ issued on April 19, 1966. Poly-p-xylylene coatings can be prepared by methods wel]. known in the art, e.g., as described in U. S. Patent 3,288,728 entitled .
30 "Para-Xylylene Copolymers," issued November 29, 1966 and
10~0583 !- ..
', "
A polymeric dielectric coating on the surface of a conductive disc is hardened by exposing the coating to a glow discharge after the coating has been deposited on the con-ductive disc. An improved information storage means of thetype having capacitance variations which can be displayed through a playback system. The information storage means includes a conductive disc having information recorded in the form of geometric variations in the surface thereof 10 with a thin conformal coating thereon of poly-p-xylylene. ;
The storage means is improved by hardening the coating by -;
glow discharge techniques.
....~ ' ' ' ' According to the presen-t invention, a metallized 15 vinyl disc, i.e., a conductive disc, having a spiral groove ;
therein can be coated with poly-p-xylylene, e.g., poly-p-chloro-xylylene. It is necessary, in order to successfully coat a surface with a truly linear poly-p-xylylene coating, to first cleave the cyclic dimer, di-p-xylylene, to obtain 20 the reactive vaporous radicals which are then condensed ~-upon the surface, wherein the radicals condense and polymerize to form a linear homopolymeric or copolymeric coating depending upon the initial choice of dimeric reactants, system pressure, and the temperature of the surface to be coated. The vapor :~
25 deposition takes place in apparatus similar to that described ;`
in U. S. patent No. 3,246,627 entitled, 'IApparatus For Vapor Depositlon,!~ issued on April 19, 1966. Poly-p-xylylene coatings can be prepared by methods wel]. known in the art, e.g., as described in U. S. Patent 3,288,728 entitled .
30 "Para-Xylylene Copolymers," issued November 29, 1966 and
- 4 - ;
.. , ~'.:' . ~ RCA 67,502 .
,, 1~4Q583 :-. 1 -U. S. Patent 3,392,754 entitled, "Para-Xylylene Polymers,~ ~
; ~, issued September 19, 1967. Poly-p-chloro-xylylene can be prepared as described in the latter patent. Standard ,. . .
. deposition techniques are employed wherein one skilled in :
.. , ~'.:' . ~ RCA 67,502 .
,, 1~4Q583 :-. 1 -U. S. Patent 3,392,754 entitled, "Para-Xylylene Polymers,~ ~
; ~, issued September 19, 1967. Poly-p-chloro-xylylene can be prepared as described in the latter patent. Standard ,. . .
. deposition techniques are employed wherein one skilled in :
5 the art is able to produce thin conformal coatings without .- pinholes, e.g., less than 500 Angstroms, hereinafter A.
The coated disc is then coated with a lubricant such as the standard 50 centistoke viscosity methyl alkyl silicone which is commercially available as SF 11~7 50 centistoke from 10 General Electric. The coated discs have a playing li~e of about 100 plays which is satisfactory ~or some purposes.
~ccording to the method o~ the present invention, an ~ applied dielectric coating on a metallized vinyl disc, such ; as a coating o~ poly-p-xylylene, can be subsequently hardened ~
15 by exposing the coated disc to a glow discharge. The .;
conductive disc is exposed to a glow discharge prior to . ~
being coated with the standard lubricant. The use of glow :.
discharge techniques for the application of thin ~ilms is well known, e.g., U. S. Patent 3,318,790 entitled, ~tProduction ~
o:~ Thin Organic Polymer By Screened Glow Discharge," issued on May 9, 1967. The application o~ the dielectric coating itself need not be done with glow discharge, e.g., conventional ; vapor deposition will suf~ice, as described in the a~ore-. mentioned U. S. Patent 3,246,627 or any other method amenable ~:
. 25 to mass production. The dielectric material, coating thickness, ..
:~ and hardness desired determine the operating parameters o~
the glow discharge which can be readily determined by a series `
o~ test runs by one skilled in the art. :.:
It was ~ound that exposing a coated video disc to a 30 glow discharge of 10 to 30 KHz, ~or times greater than 30 ~'~
; ~, '"', : . , ~, , , .. , , , , , .. ,, ~, .
RCA 67,502 ~
.. . . . .
104~S1~3 l -seconds, increases the hardness o~ the coating. The coated video disc is mounted in a vacuum chamber where the glow discharge is to take place. The chamber is then evacuated, preferably to a pressure in the range of 1 to 20 microns.
Then, an ionizing material, e.g., nitrogen, air, etc., is pumped into the chamber to a pressure of from 50 to 1000 microns. A potential of from 600 to 800 volts is applied.
The glow discharge increases the degree of crosslinking and the molecular weight of the coating and thus can be success-fully employed for hardening most polymeric coatings.
The invention can be further illustrated by the ~ollowing example, but it is to be understood that the invention is not meant to be limited to the details described therein. i EXAMPLE
A vinyl disc, metallized with a gold layer was `-coated with poly-p-chloro-xylylene. The gold coating was O : .
approximately 470A thick and was applied by vapor deposition, e.g., as described in the aforementioned U. S. Patent 3,246,627.
20 The coating was capable of about lO0 satisfactory plays ;
before a plastic deformation o~ the poly-p-chloro-xylylene dielectric coating became evident under the pressure of the stylus. Although this number of plays is satisfactory for some purposes, a prolonged record life is desirable as a safety factor.
-The video disc coated with poly-p-chloro-xylylene was mounted in a vacuum chamber between two spaced parallel -electrodes. The coated disc was placed in contacting relation with one of the electrodes with its coated side facing -the other electrode. The chamber was evacuated to a pressure in
The coated disc is then coated with a lubricant such as the standard 50 centistoke viscosity methyl alkyl silicone which is commercially available as SF 11~7 50 centistoke from 10 General Electric. The coated discs have a playing li~e of about 100 plays which is satisfactory ~or some purposes.
~ccording to the method o~ the present invention, an ~ applied dielectric coating on a metallized vinyl disc, such ; as a coating o~ poly-p-xylylene, can be subsequently hardened ~
15 by exposing the coated disc to a glow discharge. The .;
conductive disc is exposed to a glow discharge prior to . ~
being coated with the standard lubricant. The use of glow :.
discharge techniques for the application of thin ~ilms is well known, e.g., U. S. Patent 3,318,790 entitled, ~tProduction ~
o:~ Thin Organic Polymer By Screened Glow Discharge," issued on May 9, 1967. The application o~ the dielectric coating itself need not be done with glow discharge, e.g., conventional ; vapor deposition will suf~ice, as described in the a~ore-. mentioned U. S. Patent 3,246,627 or any other method amenable ~:
. 25 to mass production. The dielectric material, coating thickness, ..
:~ and hardness desired determine the operating parameters o~
the glow discharge which can be readily determined by a series `
o~ test runs by one skilled in the art. :.:
It was ~ound that exposing a coated video disc to a 30 glow discharge of 10 to 30 KHz, ~or times greater than 30 ~'~
; ~, '"', : . , ~, , , .. , , , , , .. ,, ~, .
RCA 67,502 ~
.. . . . .
104~S1~3 l -seconds, increases the hardness o~ the coating. The coated video disc is mounted in a vacuum chamber where the glow discharge is to take place. The chamber is then evacuated, preferably to a pressure in the range of 1 to 20 microns.
Then, an ionizing material, e.g., nitrogen, air, etc., is pumped into the chamber to a pressure of from 50 to 1000 microns. A potential of from 600 to 800 volts is applied.
The glow discharge increases the degree of crosslinking and the molecular weight of the coating and thus can be success-fully employed for hardening most polymeric coatings.
The invention can be further illustrated by the ~ollowing example, but it is to be understood that the invention is not meant to be limited to the details described therein. i EXAMPLE
A vinyl disc, metallized with a gold layer was `-coated with poly-p-chloro-xylylene. The gold coating was O : .
approximately 470A thick and was applied by vapor deposition, e.g., as described in the aforementioned U. S. Patent 3,246,627.
20 The coating was capable of about lO0 satisfactory plays ;
before a plastic deformation o~ the poly-p-chloro-xylylene dielectric coating became evident under the pressure of the stylus. Although this number of plays is satisfactory for some purposes, a prolonged record life is desirable as a safety factor.
-The video disc coated with poly-p-chloro-xylylene was mounted in a vacuum chamber between two spaced parallel -electrodes. The coated disc was placed in contacting relation with one of the electrodes with its coated side facing -the other electrode. The chamber was evacuated to a pressure in
- 6 -~ RCA 67,502 .
, :
~ ~)4(~583 I the range of 1 to 10 microns and then air was pumped into the chamber to a pressure of about 500 microns. The electrodes were connected to a source of current such tha$
the applied potential during glow discharge was 650 volts.
A 20 KHz current was turned on for ten minutes so as to establish a glow to which the coated side of the disc - was uniformly exposed. The disc was taken out of the vacuum and coated with a lubricant such as the aforementioned SF 1147 50 centistoke available from General Electric.
After exposure to the glow discharge and after being coated by the standard lubricant, the video disc was played on a standard player with the picture quality being evaluated by dropout count. No increase in dropout count or visual degradation of the picture was observed for 1200 plays.
2~
.
~, ~ 25 ' ,' : ' ,
, :
~ ~)4(~583 I the range of 1 to 10 microns and then air was pumped into the chamber to a pressure of about 500 microns. The electrodes were connected to a source of current such tha$
the applied potential during glow discharge was 650 volts.
A 20 KHz current was turned on for ten minutes so as to establish a glow to which the coated side of the disc - was uniformly exposed. The disc was taken out of the vacuum and coated with a lubricant such as the aforementioned SF 1147 50 centistoke available from General Electric.
After exposure to the glow discharge and after being coated by the standard lubricant, the video disc was played on a standard player with the picture quality being evaluated by dropout count. No increase in dropout count or visual degradation of the picture was observed for 1200 plays.
2~
.
~, ~ 25 ' ,' : ' ,
- 7 -:':
Claims (4)
1. An information storage means of the type wherein capacitance variations are provided to a playback system and said storage means includes a conductive disc having information recorded in the form of geometric variations in the surface thereof, wherein the improvement comprises:
a dielectric coating of hardened poly-p-xylylene on said conductive disc, said coating hardened by exposure to a glow discharge to crosslink said poly-p-xylylene after said coating has been completely deposited on said conductive disc, said coating being conformal with said geometric variations.
a dielectric coating of hardened poly-p-xylylene on said conductive disc, said coating hardened by exposure to a glow discharge to crosslink said poly-p-xylylene after said coating has been completely deposited on said conductive disc, said coating being conformal with said geometric variations.
2. An information storage means in accordance with claim 1 wherein said dielectric coating is poly-p-chloro-xylylene.
3. An information storage means in accordance with claim 1 wherein said coating has been hardened by exposure to said glow discharge for at least 30 seconds after said coating has been deposited on said conductive disc.
4. An information storage means in accordance with claim 3 wherein said coating is approximately 500A in thick-ness.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US439582A US3901994A (en) | 1974-02-04 | 1974-02-04 | Metallized video disc having a dielectric coating thereon |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1040583A true CA1040583A (en) | 1978-10-17 |
Family
ID=23745294
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA218,638A Expired CA1040583A (en) | 1974-02-04 | 1975-01-24 | Metallized video disc having a dielectric coating thereon and method of hardening the same |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US3901994A (en) |
| JP (1) | JPS50110301A (en) |
| CA (1) | CA1040583A (en) |
| DE (1) | DE2503045A1 (en) |
| FR (1) | FR2259687B1 (en) |
| GB (1) | GB1445546A (en) |
| NL (1) | NL7501237A (en) |
Families Citing this family (31)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4018945A (en) * | 1975-06-19 | 1977-04-19 | Rca Corporation | Method of making a metallized video disc having an insulating layer thereon |
| US3984907A (en) * | 1975-07-25 | 1976-10-12 | Rca Corporation | Adherence of metal films to polymeric materials |
| US3982066A (en) * | 1975-07-25 | 1976-09-21 | Rca Corporation | Metal coating for video discs |
| US4206256A (en) * | 1975-08-21 | 1980-06-03 | Rca Corporation | Metallized video disc having an insulating layer thereon |
| US4054680A (en) * | 1976-06-28 | 1977-10-18 | General Electric Company | Method of fabricating improved capacitors and transformers |
| US4077051A (en) * | 1977-05-04 | 1978-02-28 | Rca Corporation | Video disc with a conductive layer having an oxygen content gradient |
| US4072985A (en) * | 1977-05-04 | 1978-02-07 | Rca Corporation | Video disc with a dielectric layer formed from styrene and nitrogen |
| US4077052A (en) * | 1977-05-04 | 1978-02-28 | Rca Corporation | Video disc capacitive recording means with a conductive bilayer |
| DE2826122A1 (en) * | 1977-06-14 | 1978-12-21 | Fuji Photo Film Co Ltd | RECORDING MATERIAL |
| US4123308A (en) * | 1977-10-19 | 1978-10-31 | Union Carbide Corporation | Process for chemically bonding a poly-p-xylylene to a thermosetting resin and article produced thereby |
| US4137550A (en) * | 1977-11-18 | 1979-01-30 | Rca Corporation | Video disc with a dielectric layer formed from acetylene and nitrogen |
| JPS5518461A (en) * | 1978-07-27 | 1980-02-08 | Shin Etsu Chem Co Ltd | Improving method of record disc |
| US4360820A (en) * | 1979-10-01 | 1982-11-23 | Omex | Laser recording medium |
| US4410581A (en) * | 1979-10-01 | 1983-10-18 | Omex | Laser recording medium |
| GB2061543B (en) * | 1979-10-01 | 1983-08-17 | Omex | Laser-recording medium |
| USRE31533E (en) * | 1980-02-01 | 1984-03-06 | Minnesota Mining And Manufacturing Company | Information carrying discs |
| US4374077A (en) * | 1980-02-01 | 1983-02-15 | Minnesota Mining And Manufacturing Company | Process for making information carrying discs |
| US4296158A (en) * | 1980-02-01 | 1981-10-20 | Minnesota Mining And Manufacturing Company | Information carrying discs |
| US4304806A (en) * | 1980-02-01 | 1981-12-08 | Minnesota Mining And Manufacturing Company | Information carrying discs |
| US4363844A (en) * | 1980-09-22 | 1982-12-14 | Lewis Terry W | Metallized information carrying discs |
| US4519065A (en) * | 1980-09-22 | 1985-05-21 | Minnesota Mining And Manufacturing Company | Metallized information carrying discs |
| US4503126A (en) * | 1982-08-18 | 1985-03-05 | Foster Grant Corporation | Method of making an abrasion resistant coating on a solid substrate and articles produced thereby |
| US4435476A (en) | 1982-08-18 | 1984-03-06 | Foster Grant Corporation | Method of making an abrasion resistant coating on a solid substrate and articles produced thereby |
| US4565615A (en) * | 1984-11-01 | 1986-01-21 | Pennwalt Corporation | Glow discharge stabilization of piezoelectric polymer film |
| IT1191646B (en) * | 1985-12-19 | 1988-03-23 | Montedison Spa | PROCESS FOR THE ADHESION OF POLY-P.XYLYLENE TO SUBSTRATES AND ARTICLES OBTAINED |
| IT1199795B (en) * | 1986-12-17 | 1988-12-30 | Ausimont Spa | PROCESS FOR THE CONSOLIDATION OF MATERIALS WITH DISCONTINUOUS STRUCTURE |
| US4921723A (en) * | 1987-10-16 | 1990-05-01 | The Curators Of The University Of Missouri | Process for applying a composite insulative coating to a substrate |
| US5137780A (en) * | 1987-10-16 | 1992-08-11 | The Curators Of The University Of Missouri | Article having a composite insulative coating |
| GB2248072B (en) * | 1990-09-22 | 1994-03-09 | Gec Ferranti Defence Syst | A method of fabricating coaxial cable components and coaxial cable components fabricated thereby |
| US6030381A (en) * | 1994-03-18 | 2000-02-29 | Medicor Corporation | Composite dielectric coating for electrosurgical implements |
| EP0934127B1 (en) * | 1996-10-25 | 2001-09-26 | Specialty Coating Systems, Inc. | Process for making a parylene coating |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3252830A (en) * | 1958-03-05 | 1966-05-24 | Gen Electric | Electric capacitor and method for making the same |
| US3246627A (en) * | 1962-10-05 | 1966-04-19 | Union Carbide Corp | Apparatus for vapor deposition |
| US3402073A (en) * | 1964-08-04 | 1968-09-17 | Texas Instruments Inc | Process for making thin film circuit devices |
| US3342754A (en) * | 1966-02-18 | 1967-09-19 | Union Carbide Corp | Para-xylylene polymers |
| US3666533A (en) * | 1970-11-16 | 1972-05-30 | North American Rockwell | Deposition of polymeric coatings utilizing electrical excitation |
| US3842194A (en) * | 1971-03-22 | 1974-10-15 | Rca Corp | Information records and recording/playback systems therefor |
| US3753773A (en) * | 1972-04-26 | 1973-08-21 | North American Rockwell | Coating of poly-para-heterocyclic-xylene polymer |
-
1974
- 1974-02-04 US US439582A patent/US3901994A/en not_active Expired - Lifetime
-
1975
- 1975-01-24 CA CA218,638A patent/CA1040583A/en not_active Expired
- 1975-01-25 DE DE19752503045 patent/DE2503045A1/en active Pending
- 1975-01-28 GB GB373575A patent/GB1445546A/en not_active Expired
- 1975-01-30 JP JP50013300A patent/JPS50110301A/ja active Pending
- 1975-01-31 FR FR7503070A patent/FR2259687B1/fr not_active Expired
- 1975-02-03 NL NL7501237A patent/NL7501237A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| US3901994A (en) | 1975-08-26 |
| DE2503045A1 (en) | 1975-08-28 |
| FR2259687A1 (en) | 1975-08-29 |
| NL7501237A (en) | 1975-08-06 |
| GB1445546A (en) | 1976-08-11 |
| JPS50110301A (en) | 1975-08-30 |
| FR2259687B1 (en) | 1978-10-27 |
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