Patent US4045712A successfully refreshed from Google Patents.
US4045712A
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Voltage responsive switches and methods of making
Assignee: General Electric Co
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Filing: 1976-03-15
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Granted: 1977-08-30
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Expires: 1996-03-15
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
2026-10-30 20:48
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
91 words
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 a hundred ohms, said switch comprising: a pair of spaced electrodes on a support member; and a mixture of a substantially pure grade copper powder having an oxidized outer surface and an organic binder overlying a portion of said spaced electrodes, the space therebetween and said support member, said mixture including approximately one part binder to two to five parts oxidized copper powder.
Claim 2
Dependent Claim
91 words
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 a hundred ohms, said switch comprising: a pair of spaced electrodes on a support member; and a mixture of a substantially pure grade copper powder having an oxidized outer surface and an organic binder overlying a portion of said spaced electrodes, the space therebetween and said support member, said mixture including approximately one part binder to two to five parts oxidized copper powder.
Claim 3
Dependent Claim
16 words
The switch of claim 1 wherein said electrodes are spaced approximately 25 to 200 mils apart.
Claim 4
Dependent Claim
20 words
The switch of claim 1 wherein said oxidized copper powder has a particle size of between one and thirty microns.
Claim 5
Dependent Claim
35 words
The switch of claim 1 further comprising: a flash lamp connected in electrical series relationship with said switch; a voltage source; and means for connecting said voltage source to said switch and said flash lamp.
Claim 6
Dependent Claim
13 words
The switch of claim 4 wherein said voltage source comprises a piezoelectric generator.
Claim 7
Dependent Claim
27 words
The switch of claim 4 comprising a plurality of flash lamps and switches each operatively connected in electrical series relationship for sequential firing of said flash lamps.
References Cited (Backward Citations)
CA959533A
Cited
US3969066A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-29 | 1981-02-28 | 1981-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-29 | 1985-02-28 | 1985-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-29 | 1989-02-28 | 1989-08-30 | $7700.00 | Window Closed / Lapsed |