CA1337488C - Magnetic separator - Google Patents
Magnetic separatorInfo
- Publication number
- CA1337488C CA1337488C CA000596686A CA596686A CA1337488C CA 1337488 C CA1337488 C CA 1337488C CA 000596686 A CA000596686 A CA 000596686A CA 596686 A CA596686 A CA 596686A CA 1337488 C CA1337488 C CA 1337488C
- Authority
- CA
- Canada
- Prior art keywords
- belt drum
- magnet system
- belt
- fact
- magnetic separator
- 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 - Lifetime
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/23—Magnetic separation acting directly on the substance being separated with material carried by oscillating fields; with material carried by travelling fields, e.g. generated by stationary magnetic coils; Eddy-current separators, e.g. sliding ramp
- B03C1/24—Magnetic separation acting directly on the substance being separated with material carried by oscillating fields; with material carried by travelling fields, e.g. generated by stationary magnetic coils; Eddy-current separators, e.g. sliding ramp with material carried by travelling fields
- B03C1/247—Magnetic separation acting directly on the substance being separated with material carried by oscillating fields; with material carried by travelling fields, e.g. generated by stationary magnetic coils; Eddy-current separators, e.g. sliding ramp with material carried by travelling fields obtained by a rotating magnetic drum
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C2201/00—Details of magnetic or electrostatic separation
- B03C2201/20—Magnetic separation whereby the particles to be separated are in solid form
Abstract
In the case of the magnetic separator in which a conveyor belt conducted over a belt drum (12) transports rela-tively electrically conductive particles (16), a magnetic system (20) rotating at high speed and consisting or permanent or electromagnets is arranged eccentrically in the belt drum (12) so that the air gap between the outer surface of the magnet system (20) and the inner surface of the belt drum (12) is not constant but assumes such a value that the magnetic lines of force lose their influence on an iron particle (48) coming between the belt drum (12) and the conveyor belt (10) and the iron particles (48) and by scrapers (40, 44) [sic] can be removed from the belt drum (12) or the conveyor belt (10) a damaging of the belt drum (12) by the iron particle (48) is thus excluded.
Description
- The invention relates to a magnetic separator having a conveyor belt conducted over a belt drum of electrically nonconductive material for the transport of the fraction to be sorted which consists of particles of relatively good elec-trical conductivity, having a magnet system which can be driven in rotation inside the belt drum at a speed higher than that of the belt drum, and having a collecting container arranged behind the belt drum for the electrically conductive particles separated out.
Such a device is known from U.S. Patent No. 3,448,857.
In this known device, a magnet system arranged inside a drum rotates within the belt drum at a speed of about 1500 rpm, while the conveyor belt conveys the fraction to be sorted to the belt drum and thus to the magnet system at a speed of l m/sec to l.5 m/sec. The drum in which the magnet system is arranged has an outside diameter which corresponds approximately to the inside diameter of the belt drum, and a small constant air gap is developed between magnet system and belt drum. During operation, a relative movement is produced between the conveyor belt and the drum in which the magnet system is contained, and this difference in speed has the result that the magnetic lines of force intersect the electrically conductive particles fed on the conveyor belt, whereby currents are induced the strength of which depends on the electrical conductivity of the particles. In the particles of greater electrical conduc-tivity a stronger current is produced which has the result that these particles follow a tra~ectory into the collecting container arranged in front of the belt drum. Particles of lower electrical conductivity, on the other hand, remain near the conveyor belt and fall off the conveyor belt shortly before the collecting container.
~A
-~- 1 337488 Despite extensive precautionary measures, it can happen that a ferromagnetic particle comes between the conveyor belt and its belt drum. It is also possible for such a particle to come between the belt drum and the conveyor belt through a worn place in a conveyor belt. These ferromagnetic particles are held fast due to the magnetic force and rotate on the belt drum. In order not to impair the effect of the magnetic system, the belt drum must consist of a nonconductive material.
As a rule, the belt drum of such a system consists of plastic.
Such plastic material, however, will melt even at relatively low temperatures. A magnetizable electrically conductive particle, i.e., an iron particle, which is stuck between conveyor belt and belt drum is heated so strongly by the alternative magnetic field of the magnet system that it begins to glow. In this condition, the particle may work its way through the plastic of the belt drum and pass into the air gap between the outer surface of the magnet system and the inner surface of the belt drum. This may then result in severe damage to the device since the rapidly rotating magnet system entrains the iron particle and, for example, slits open the circumferential wall of the belt drum. This results in the shutting down of the system of and expensive repair.
The object of the invention is to develop a magnetic separator of the type described, in such a manner that damage to the belt drum as a result of particles coming between the conveyor belt and the belt drum are avoided.
In a broad aspect, then the present invention relates to a magnetic separator, having a conveyor belt guided over a belt .
drum of electrically nonconductive material for the transport of the material to be sorted, said material including particles of relatively good electrical conductivity and particles of relatively lesser conductivity; said separator including a cylindrical magnet system which can be driven in rotation inside the belt drum at a speed higher than that of the belt drum to induce a relatively stronger current in particles of relatively good conductivity and a relatively weaker current in particles of relatively lesser conductivity, to impart a trajectory to said particles of relatively good conductivity; and a container arranged behind the belt drum for collecting the electrically conductive particles thereby separated out; said separator being characterized by the fact that the magnet system is arranged eccentrically in the belt drum, and the outside diameter of the magnet system is sufficiently less than the inside diameter of the belt drum whereby the influence of magnetic lines of force on an iron particle caught between the belt drum and the belt is such that it either adheres to the belt drum or drops onto the lower course of the conveyor belt.
Such a device is known from U.S. Patent No. 3,448,857.
In this known device, a magnet system arranged inside a drum rotates within the belt drum at a speed of about 1500 rpm, while the conveyor belt conveys the fraction to be sorted to the belt drum and thus to the magnet system at a speed of l m/sec to l.5 m/sec. The drum in which the magnet system is arranged has an outside diameter which corresponds approximately to the inside diameter of the belt drum, and a small constant air gap is developed between magnet system and belt drum. During operation, a relative movement is produced between the conveyor belt and the drum in which the magnet system is contained, and this difference in speed has the result that the magnetic lines of force intersect the electrically conductive particles fed on the conveyor belt, whereby currents are induced the strength of which depends on the electrical conductivity of the particles. In the particles of greater electrical conduc-tivity a stronger current is produced which has the result that these particles follow a tra~ectory into the collecting container arranged in front of the belt drum. Particles of lower electrical conductivity, on the other hand, remain near the conveyor belt and fall off the conveyor belt shortly before the collecting container.
~A
-~- 1 337488 Despite extensive precautionary measures, it can happen that a ferromagnetic particle comes between the conveyor belt and its belt drum. It is also possible for such a particle to come between the belt drum and the conveyor belt through a worn place in a conveyor belt. These ferromagnetic particles are held fast due to the magnetic force and rotate on the belt drum. In order not to impair the effect of the magnetic system, the belt drum must consist of a nonconductive material.
As a rule, the belt drum of such a system consists of plastic.
Such plastic material, however, will melt even at relatively low temperatures. A magnetizable electrically conductive particle, i.e., an iron particle, which is stuck between conveyor belt and belt drum is heated so strongly by the alternative magnetic field of the magnet system that it begins to glow. In this condition, the particle may work its way through the plastic of the belt drum and pass into the air gap between the outer surface of the magnet system and the inner surface of the belt drum. This may then result in severe damage to the device since the rapidly rotating magnet system entrains the iron particle and, for example, slits open the circumferential wall of the belt drum. This results in the shutting down of the system of and expensive repair.
The object of the invention is to develop a magnetic separator of the type described, in such a manner that damage to the belt drum as a result of particles coming between the conveyor belt and the belt drum are avoided.
In a broad aspect, then the present invention relates to a magnetic separator, having a conveyor belt guided over a belt .
drum of electrically nonconductive material for the transport of the material to be sorted, said material including particles of relatively good electrical conductivity and particles of relatively lesser conductivity; said separator including a cylindrical magnet system which can be driven in rotation inside the belt drum at a speed higher than that of the belt drum to induce a relatively stronger current in particles of relatively good conductivity and a relatively weaker current in particles of relatively lesser conductivity, to impart a trajectory to said particles of relatively good conductivity; and a container arranged behind the belt drum for collecting the electrically conductive particles thereby separated out; said separator being characterized by the fact that the magnet system is arranged eccentrically in the belt drum, and the outside diameter of the magnet system is sufficiently less than the inside diameter of the belt drum whereby the influence of magnetic lines of force on an iron particle caught between the belt drum and the belt is such that it either adheres to the belt drum or drops onto the lower course of the conveyor belt.
- 2(a) -~ If, in the permanent magnet separator in accordance with the invention, an iron particle comes between the belt drum and the belt, it is clamped between the belt drum and the belt and in this way, it is true, initially conducted past the rapidly rotating magnet system; however, it cannot be held fast by the latter but is, rather, upon the rotation of the belt drum, necessarily conducted a greater distance away from the magnet system. In this way, the influence of the magnetic lines of force on the iron particle becomes so slight that it either adheres to the belt drum or drops onto the lower course of the conveyor belt.
Scrapers are preferably arranged on the outside of the belt drum between the upper and the lower course of the conveyor belt and/or on the inside of the lower course of the conveyor belt behind the belt drum so that iron particles which come between the conveyor belt and the belt drum can be scraped - off from the belt drum or the lower course of the conveyor belt and conducted away. A damaging of the belt drum by the enclosed iron particle is thus excluded.
In accordance with a preferred embodiment, the magnet system can be swung around the center of the belt drum so that the relative position between magnet system and belt drum can be ad~usted with simple means and maintenance can, for instance, be facilitated.
The air gap between drum wall and magnet system is preferably adJustable.
The diameter of the magnet system is preferably half as large as the diameter of the belt drum so that the magnet ~ system can be swung 360 around the center of the belt drum.
The magnet system can consist of permanent or electro-magnets.
One embodiment of the invention will be described in greater detail below on basis of the drawing.
L~ 1 337488 - The Figure shows a conveyor belt 10, which is conducted over a belt drum 12. A fraction of relatively electrically conductive particles 16 is arranged on the upper course 14 of the conveyor belt 10 and is transported at a speed of about 1 m/sec to 1.5 m/sec on the conveyor belt 10 in the direction of the arrow 18. The belt drum 12 consists of electrically nonconductive material, for instance a plastic.
Within the belt drum 12 there is arranged a magnet system 20 with permanent magnets or electromagnets 22 which are provided in a cylindrical drum 24. The cylindrical drum Z4 of the magnet system 20 has about half the diameter of the belt drum 12. The center 26 of the cylindrical drum 24 is arranged eccentrically to the center 28 of the belt drum 12.
The cylindrical drum 24 with the magnets 22 is swingable by means of arms 30 around the center 28 of the belt drum 12. In order to separate particles of good electrical conductivity from particles of less electrical conductivity in an optimal manner, the magnet system 20 is arranged in the position shown in the Figure. The magnet system 20 rotates around the center 26 at a speed of about 1500 rpm.
A container 32 is arranged in front of the belt drum 12, the particles 34 of good electrical conductivity falling in said container. During transport on the conveyor belt 10, the magnetic lines of force of the magnet system 20 intersect the belt drum 12, the conveyor belt 10 and the electrically conductive particles 16 fed on the conveyor belt. In this way, currents are induced in the electrically conductive parti-cles which currents are stronger in the case of particles of good electrical conductivity than in the case of particles of lesser electrical conductivity. The particles of good elec-~- 1 337488 trical conductivity are then accelerated onto a tra~ectory which is indicated by the arrow 36. The less conductive parti-cles remain near the conveyor belt and fall down between it and the container 32. An air gap 38 is developed between the outer surface of the cylindrical drum 24 of the magnet system 20 and the inner surface of the belt drum 12, the air gap chang-ing continuously due to the eccentric arrangement of the magnet system 20 in the belt drum 12. On the outer surface of the belt drum 12, opposite the magnet system 20 arranged in the belt drum 12, there is a scraper 40 and a collecting container 42 arranged below it. Another scraper 44 is provided on the inner surface of the lower course 46 of the conveyor belt 10.
The air gap 38 between the belt drum 12 and the magnet system is infinitely ad~ustable by displacing the center 26 of the magnet system 20 along the slot 50 in the arm 30.
If an iron particle 48 comes between the inner side of the conveyor belt 10 and the outside of the drum 12 for any unforeseeable and undesired reason, then a current is induced in said particle by the action of the magnetic lines of force of the magnetic field 20 and the iron particle 48 is entrained on the outer surface of the belt drum 12, as the result of the higher speed of rotation of the magnet system 20, until, after sufficient rotation of the belt drum 12, the distance between the iron particle 48 arranged on its outside surface and the magnet system 20 becomes so large that the magnetic lines of force lose their influence on the iron particle 48.
If the iron particle 48 continues to adhere to the belt drum 12, it can be scraped off by the scraper 40 and deposited in the collecting container 42. If the particle drops down before this from the outer surface of the belt drum 12 onto the lower course -!16 3 then it is removed by the scraper 44 from the space between upper and lower course of the conveyor belt 10. The eccentric arrangement of the magnet system 20 in the belt drum 12 and the smaller diameter of the magnet system 20 prevent an iron particle 48 which comes between belt drum 12 and conveyor belt 10 being entrained by the magnet system at a speed which is greater than that of the belt drum 12, so that, due to the fact that the iron particle 48 does not experience any extensive heating as a result of the influence of the magnet system 20, any damaging of the belt drum 12, i.e. a slitting open thereof by the iron particle 48, is excluded.
Scrapers are preferably arranged on the outside of the belt drum between the upper and the lower course of the conveyor belt and/or on the inside of the lower course of the conveyor belt behind the belt drum so that iron particles which come between the conveyor belt and the belt drum can be scraped - off from the belt drum or the lower course of the conveyor belt and conducted away. A damaging of the belt drum by the enclosed iron particle is thus excluded.
In accordance with a preferred embodiment, the magnet system can be swung around the center of the belt drum so that the relative position between magnet system and belt drum can be ad~usted with simple means and maintenance can, for instance, be facilitated.
The air gap between drum wall and magnet system is preferably adJustable.
The diameter of the magnet system is preferably half as large as the diameter of the belt drum so that the magnet ~ system can be swung 360 around the center of the belt drum.
The magnet system can consist of permanent or electro-magnets.
One embodiment of the invention will be described in greater detail below on basis of the drawing.
L~ 1 337488 - The Figure shows a conveyor belt 10, which is conducted over a belt drum 12. A fraction of relatively electrically conductive particles 16 is arranged on the upper course 14 of the conveyor belt 10 and is transported at a speed of about 1 m/sec to 1.5 m/sec on the conveyor belt 10 in the direction of the arrow 18. The belt drum 12 consists of electrically nonconductive material, for instance a plastic.
Within the belt drum 12 there is arranged a magnet system 20 with permanent magnets or electromagnets 22 which are provided in a cylindrical drum 24. The cylindrical drum Z4 of the magnet system 20 has about half the diameter of the belt drum 12. The center 26 of the cylindrical drum 24 is arranged eccentrically to the center 28 of the belt drum 12.
The cylindrical drum 24 with the magnets 22 is swingable by means of arms 30 around the center 28 of the belt drum 12. In order to separate particles of good electrical conductivity from particles of less electrical conductivity in an optimal manner, the magnet system 20 is arranged in the position shown in the Figure. The magnet system 20 rotates around the center 26 at a speed of about 1500 rpm.
A container 32 is arranged in front of the belt drum 12, the particles 34 of good electrical conductivity falling in said container. During transport on the conveyor belt 10, the magnetic lines of force of the magnet system 20 intersect the belt drum 12, the conveyor belt 10 and the electrically conductive particles 16 fed on the conveyor belt. In this way, currents are induced in the electrically conductive parti-cles which currents are stronger in the case of particles of good electrical conductivity than in the case of particles of lesser electrical conductivity. The particles of good elec-~- 1 337488 trical conductivity are then accelerated onto a tra~ectory which is indicated by the arrow 36. The less conductive parti-cles remain near the conveyor belt and fall down between it and the container 32. An air gap 38 is developed between the outer surface of the cylindrical drum 24 of the magnet system 20 and the inner surface of the belt drum 12, the air gap chang-ing continuously due to the eccentric arrangement of the magnet system 20 in the belt drum 12. On the outer surface of the belt drum 12, opposite the magnet system 20 arranged in the belt drum 12, there is a scraper 40 and a collecting container 42 arranged below it. Another scraper 44 is provided on the inner surface of the lower course 46 of the conveyor belt 10.
The air gap 38 between the belt drum 12 and the magnet system is infinitely ad~ustable by displacing the center 26 of the magnet system 20 along the slot 50 in the arm 30.
If an iron particle 48 comes between the inner side of the conveyor belt 10 and the outside of the drum 12 for any unforeseeable and undesired reason, then a current is induced in said particle by the action of the magnetic lines of force of the magnetic field 20 and the iron particle 48 is entrained on the outer surface of the belt drum 12, as the result of the higher speed of rotation of the magnet system 20, until, after sufficient rotation of the belt drum 12, the distance between the iron particle 48 arranged on its outside surface and the magnet system 20 becomes so large that the magnetic lines of force lose their influence on the iron particle 48.
If the iron particle 48 continues to adhere to the belt drum 12, it can be scraped off by the scraper 40 and deposited in the collecting container 42. If the particle drops down before this from the outer surface of the belt drum 12 onto the lower course -!16 3 then it is removed by the scraper 44 from the space between upper and lower course of the conveyor belt 10. The eccentric arrangement of the magnet system 20 in the belt drum 12 and the smaller diameter of the magnet system 20 prevent an iron particle 48 which comes between belt drum 12 and conveyor belt 10 being entrained by the magnet system at a speed which is greater than that of the belt drum 12, so that, due to the fact that the iron particle 48 does not experience any extensive heating as a result of the influence of the magnet system 20, any damaging of the belt drum 12, i.e. a slitting open thereof by the iron particle 48, is excluded.
Claims (14)
1. A magnetic separator, having a conveyor belt guided over a belt drum of electrically nonconductive material for the transport of the material to be sorted, said material including particles of relatively good electrical conductivity and particles of relatively lesser conductivity; said separator including a cylindrical magnet system which can be driven in rotation inside the belt drum at a speed higher than that of the belt drum to induce a relatively stronger current in particles of relatively good conductivity and a relatively weaker current in particles of relatively lesser conductivity, to impart a trajectory to said particles of relatively good conductivity; and a container arranged behind the belt drum for collecting the electrically conductive particles thereby separated out; said separator being characterized by the fact that the magnet system is arranged eccentrically in the belt drum, and the outside diameter of the magnet system is sufficiently less than the inside diameter of the belt drum whereby the influence of magnetic lines of force on an iron particle caught between the belt drum and the belt is such that it either adheres to the belt drum or drops onto the lower course of the conveyor belt.
2. A magnetic separator according to Claim 1, characterized by the fact that the magnet system is arranged for swinging around the centre of the belt drum.
3. A magnetic separator according to Claim 1, characterized by the fact that the diameter of the magnet system is about half as large as the diameter of the belt drum.
4. A magnetic separator according to Claim 2, characterized by the fact that the diameter of the magnet system is about half as large as the diameter of the belt drum.
5. A magnetic separator according to Claim 1, characterized by the fact that there is an air gap between the belt drum and the magnet system that is infinitely adjustable.
6. A magnetic separator according to Claim 2, characterized by the fact that there is an air gap between the belt drum and the magnet system that is infinitely adjustable.
7. A magnetic separator according to Claim 1 characterized by the fact that the magnet system consists of permanent electro-magnets.
8. A magnetic separator according to Claim 2, characterized by the fact that the magnet system consists of permanent electro-magnets.
9. A magnetic separator according to Claim 3, characterized by the fact that the magnet system consists of permanent electro-magnets.
10. A magnetic separator according to Claim 4, characterized by the fact that the magnet system consists of permanent electro-magnets.
11. A magnetic separator according to Claim 5, characterized by the fact that the magnet system consists of permanent electro-magnets.
12. A magnetic separator according to Claim 6, characterized by the fact that the magnet system consists of permanent electro-magnets.
13. A magnetic separator according to any one of claims 1 to 12, characterized by the fact that scrapers are arranged outside of the belt drum between the upper course and the lower course of the conveyor belt.
14. A magnetic separator according to any one of claims 1 to 12, characterized by the fact that scrapers are arranged on the inside of the lower course of the conveyor belt behind the belt drum.
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Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP3813906.5 | 1988-04-25 | ||
| DE3813906 | 1988-04-25 | ||
| DE8805463 | 1988-04-25 | ||
| DE8809072U DE8809072U1 (en) | 1988-04-25 | 1988-07-14 | |
| DEP3823944.2 | 1988-07-14 | ||
| DE3823944A DE3823944C1 (en) | 1988-04-25 | 1988-07-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1337488C true CA1337488C (en) | 1995-10-31 |
Family
ID=39357434
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000596686A Expired - Lifetime CA1337488C (en) | 1988-04-25 | 1989-04-14 | Magnetic separator |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US5092986A (en) |
| EP (1) | EP0339195B1 (en) |
| JP (1) | JPH084759B2 (en) |
| CA (1) | CA1337488C (en) |
| DE (2) | DE3823944C1 (en) |
| ES (1) | ES2041353T3 (en) |
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| JPH0653531U (en) * | 1991-01-25 | 1994-07-22 | 前田建設工業株式会社 | Belt conveyor |
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Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE298617C (en) * | ||||
| DE191492C (en) * | ||||
| US1462584A (en) * | 1922-04-11 | 1923-07-24 | John G Kirschner | Placer-mining machine |
| US3448857A (en) * | 1966-10-24 | 1969-06-10 | Eriez Magnetics | Electrodynamic separator |
| FI48535C (en) * | 1972-05-26 | 1974-11-11 | Permeco Oy | Permanent magnet strong field separator |
| JPS5274168A (en) * | 1975-12-16 | 1977-06-21 | Agency Of Ind Science & Technol | Separation of hairy metallic materials from solid waste pieces |
| JPS57117353A (en) * | 1981-01-16 | 1982-07-21 | Hitachi Metals Ltd | Separating device for non-magnetic metal |
| JPS57119856A (en) * | 1981-01-20 | 1982-07-26 | Hitachi Metals Ltd | Separator of non-magnetic metal |
| DE58905733D1 (en) * | 1988-05-19 | 1993-11-04 | Lindemann Maschfab Gmbh | DEVICE FOR SEPARATING NON-MAGNETIZABLE METALS FROM A SOLID MIXTURE. |
-
1988
- 1988-07-14 DE DE3823944A patent/DE3823944C1/de not_active Expired
- 1988-07-14 DE DE8809072U patent/DE8809072U1/de not_active Expired
-
1989
- 1989-02-14 ES ES198989102517T patent/ES2041353T3/en not_active Expired - Lifetime
- 1989-02-14 EP EP89102517A patent/EP0339195B1/en not_active Expired - Lifetime
- 1989-04-14 CA CA000596686A patent/CA1337488C/en not_active Expired - Lifetime
- 1989-04-24 US US07/342,180 patent/US5092986A/en not_active Expired - Lifetime
- 1989-04-25 JP JP1107145A patent/JPH084759B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| EP0339195A3 (en) | 1990-07-11 |
| ES2041353T3 (en) | 1993-11-16 |
| JPH02218451A (en) | 1990-08-31 |
| JPH084759B2 (en) | 1996-01-24 |
| DE8809072U1 (en) | 1988-10-06 |
| EP0339195B1 (en) | 1993-06-30 |
| US5092986A (en) | 1992-03-03 |
| EP0339195A2 (en) | 1989-11-02 |
| DE3823944C1 (en) | 1989-11-30 |
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