Patent US4292261A successfully refreshed from Google Patents.
US4292261A
Expired / Lapsed
US
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Pressure sensitive conductor and method of manufacturing the same
Assignee: JSR Corp
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Filing: 1977-06-29
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Granted: 1981-09-29
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Expires: 1997-06-29
Abstract
Abstract A pressure sensitive conductor comprising an elastomer containing from 3 to 40% by volume of electrically conductive magnetic particles, which particles are dispersed in the elastomer so that high-sensitivity pressure sensitive conductor portions and insulator portions or low-sensitivity pressure sensitive conductor portions are both present therein. A method of manufacturing the pressure sensitive conductor comprises forming a sheet of a mixture containing electrically conductive magnetic particles in an elastomer, and subjecting the sheet to the action of magnetic fields before or during cross linking, thereby allowing the conductive magnetic particles to be uniformly dispersed in the sheet in a selected pattern.
Inventors
- 👤 Teizo Kotani
- 👤 Kozo Arai
- 👤 Shiomi Fukui
- 👤 Masaki Nagata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:45
CPC Classifications
H; H01; H01B; H01B1/00; H01B1/20; H01B1/22; H01B5/00; H01B5/16; H01B7/00; H01B7/10; H01C; H01C10/00; H01C10/10; H01C10/106; Y; Y10; Y10S; Y10S338/00; Y10S338/01
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
148 words
In a method for the manufacture of a pressure sensitive conductor comprising an insulating elastomer having dispersed therein from about 3% to 40% by volume based on the total volume of electrically conductive magnetic particles having a particle size of from 0.01 μm to 200 μm, the said particles being concentrated and distributed in portions of the conductor in accordance with a selected pattern in which those portions having a relatively high concentration of particles are high sensitivity conductor portions and other portions are insulator portions; the improvement comprising first forming a mixture containing said elastomer and said particles, forming said mixture into a sheet having a viscosity of from 10 4 to 10 7 poises at a strain rate of 10 -1 sec. -1 , subjecting said sheet to the action of shaped magnets forming a magnetic field of a selected pattern, and thereafter curing said elastomer.
Claim 2
Dependent Claim
148 words
In a method for the manufacture of a pressure sensitive conductor comprising an insulating elastomer having dispersed therein from about 3% to 40% by volume based on the total volume of electrically conductive magnetic particles having a particle size of from 0.01 μm to 200 μm, the said particles being concentrated and distributed in portions of the conductor in accordance with a selected pattern in which those portions having a relatively high concentration of particles are high sensitivity conductor portions and other portions are insulator portions; the improvement comprising first forming a mixture containing said elastomer and said particles, forming said mixture into a sheet having a viscosity of from 10 4 to 10 7 poises at a strain rate of 10 -1 sec. -1 , subjecting said sheet to the action of shaped magnets forming a magnetic field of a selected pattern, and thereafter curing said elastomer.
Claim 3
Dependent Claim
31 words
A method in accordance with claim 1, wherein said magnets are disposed on one side of said sheet, with the N and S poles thereof alternately in contact with said side.
Claim 4
Dependent Claim
65 words
A method in accordance with claim 1, wherein said magnets are disposed on one side of said sheet, with the N and S poles thereof alternately in contact with said side, and corresponding magnets are disposed on the other side of said sheets, with the S and N poles thereof alternately in contact with said side and opposite to said poles on said one side.
Claim 5
Dependent Claim
54 words
A method in accordance with claim 1, wherein said magnets are disposed on one side of said sheet, with only the N poles thereof in contact with said one side, and corresponding magnets are disposed on the other side of said sheet, with only the S poles thereof in contact with said other side.
Claim 6
Dependent Claim
22 words
A method in accordance with claim 1, wherein said magnets each has a pole face from 1 to 25 mm in width.
Claim 7
Dependent Claim
27 words
A method in accordance with claim 5, wherein the magnets are each in the form of a square with sides from 1 to 25 mm in length.
Claim 8
Dependent Claim
27 words
A method in accordance with claim 5, wherein the magnets are each in the form of a circle with a diameter of from 1 to 25 mm.
Claim 9
Dependent Claim
30 words
A method in accordance with claim 1, wherein said shaped magnets are in the form of a plurality of parallel ridges rising from a base and separated by parallel recesses.
Claim 10
Dependent Claim
22 words
A method in accordance with claim 8, wherein the distance between said ridges is greater than the thickness of the said sheet.
Claim 11
Dependent Claim
16 words
A method in accordance with claim 8, wherein said recesses are filled with a non-magnetic material.
Claim 12
Dependent Claim
28 words
A method in accordance with claim 1, wherein said shaped magnets are arranged in the form of rows of protuberances rising from a base and separated by recesses.
Claim 13
Dependent Claim
16 words
A method in accordance with claim 11, wherein said protuberances are in the shape of squares.
Claim 14
Dependent Claim
16 words
A method in accordance with claim 11, wherein said protuberances are in the shape of circles.
Claim 15
Dependent Claim
21 words
A method in accordance with claim 11, wherein the distance between said protuberances is greater than the thickness of said sheet.
Claim 16
Dependent Claim
16 words
A method in accordance with claim 11, wherein said recesses are filled with a non-magnetic material.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-09-28 | 1985-03-30 | 1985-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-28 | 1989-03-30 | 1989-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-28 | 1993-03-30 | 1993-09-29 | $7700.00 | Window Closed / Lapsed |