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Patent US3976811A successfully refreshed from Google Patents.
US3976811A
Expired / Lapsed
US
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Voltage responsive switches and methods of making
Assignee: General Electric Co
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Filing: 1975-03-03
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Granted: 1976-08-24
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Expires: 1995-03-03
Abstract
Abstract A method of making a voltage sensitive switch characterized by an irreversible change in resistance from a high resistance state greater than one megohm to a low resistance state less than approximately one hundred ohms is described as comprising heating substantially pure grade copper in an oxidizing environment for a sufficient time to oxidize the outer surface of the copper powder, mixing the oxidized copper powder with a binder and applying the mixture to a pair of spaced electrodes.
Inventors
- 👤 Arthur N. DeTommasi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:07
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/10; H01C7/1006; C; C09; C09D; C09D5/00; C09D5/24; H05; H05K; H05K1/00; H05K1/02; H05K1/0286; H05K1/0293; H10; H10N; H10N70/00; H10N70/011; H10N70/021; H10N70/20; H10N70/801; H10N70/821; H10N70/823; H10N70/881; H05K2203/00; H05K2203/10; H05K2203/105; H05K2203/17; H05K2203/173; H05K3/00; H05K3/30; H05K3/32; H05K3/321
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
118 words
A method of making an irreversible voltage sensitive switch characterized by a first high resistance state of greater than approximately a megohm and a second low resistance state of less than approximately 100 ohms, said method comprising the steps of: heating at approximately 70°C. to 130°C. substantially pure grade copper powder of approximately 99.99% purity for a sufficient time to oxidize the outer surface of said copper powder, said copper powder having a particle size of between approximately 1 and 30 microns; mixing the oxidized copper powder with an organic binder in ratios of approximately one part binder to two to five parts oxidized copper powder; and applying said oxidized copper-binder mixture to a pair of spaced electrodes.
Claim 2
Independent Claim
118 words
A method of making an irreversible voltage sensitive switch characterized by a first high resistance state of greater than approximately a megohm and a second low resistance state of less than approximately 100 ohms, said method comprising the steps of: heating at approximately 70°C. to 130°C. substantially pure grade copper powder of approximately 99.99% purity for a sufficient time to oxidize the outer surface of said copper powder, said copper powder having a particle size of between approximately 1 and 30 microns; mixing the oxidized copper powder with an organic binder in ratios of approximately one part binder to two to five parts oxidized copper powder; and applying said oxidized copper-binder mixture to a pair of spaced electrodes.
Claim 3
Dependent Claim
38 words
The method of claim 1 wherein the step of heating is performed at a temperature in accord with the time-voltage relationship illustrated in FIG. 2 of the drawings to provide a voltage sensitive switch of a selected voltage.
Claim 4
Dependent Claim
11 words
The method of claim 1 wherein said binder is epoxy resin.
Claim 5
Dependent Claim
11 words
The method of claim 1 wherein said binder is nitrocellulose glue.
Claim 6
Dependent Claim
29 words
The method of claim 1 further comprising the steps of heating the applied oxidized copper-binder mixture on said spaced electrodes at approximately 100°C. to 130°C. for approximately 30 minutes.
Claim 7
Dependent Claim
16 words
The method of claim 5 wherein said electrodes are spaced approximately 50 to 100 mils apart.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-24 | 1980-02-23 | 1980-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-24 | 1984-02-23 | 1984-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-24 | 1988-02-23 | 1988-08-24 | $7700.00 | Window Closed / Lapsed |