Patent US4450204A successfully refreshed from Google Patents.
US4450204A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver material suitable for backing of silver-cadmium oxide contacts and contacts employing same
Assignee: Pulse Electronics Corp
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Filing: 1982-06-17
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Granted: 1984-05-22
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Expires: 2002-06-17
Abstract
Abstract A two-layer contact having a silver backing and a silver cadmium oxide body which backing is relatively free of warpage and macroscopic voids is produced from a mixture of silver oxide, silver acetate and silver.
Inventors
- 👤 Han J. Kim
- 👤 Richard C. Bevington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:38
CPC Classifications
H; H01; H01H; H01H1/00; H01H1/02; H01H1/021; H01H1/023; H01H1/0231; B; B22; B22F; B22F7/00; B22F7/06; C; C22; C22C; C22C32/00; C22C32/001; C22C32/0015; C22C32/0021; B22F2998/00; B22F2998/10; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12049; Y10T428/12056
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
142 words
A process for producing a silver material suitable as a backing for silver-cadmium oxide contact materials comprising (a) forming a relatively uniform admixture consisting essentially of from about 1% by weight to about 15% by weight of silver oxide, from about 10% by weight to about 20% by weight of silver acetate, balance silver powder, (b) pressing said admixture at a pressure of from about 8,000 psi to about 50,000 psi to form a compacted material having a density of from about 5.0 to about 6.5 grams/cc. (c) heating said compacted material to increase its temperature at a rate of from about 10° C./minute to about 25° C./minute to a temperature of about 900° C., and (d) holding said compacted material at about 900° C. to form a silver material having a density of at a temperature of least about 9.9 grams/cc.
Claim 2
Dependent Claim
142 words
A process for producing a silver material suitable as a backing for silver-cadmium oxide contact materials comprising (a) forming a relatively uniform admixture consisting essentially of from about 1% by weight to about 15% by weight of silver oxide, from about 10% by weight to about 20% by weight of silver acetate, balance silver powder, (b) pressing said admixture at a pressure of from about 8,000 psi to about 50,000 psi to form a compacted material having a density of from about 5.0 to about 6.5 grams/cc. (c) heating said compacted material to increase its temperature at a rate of from about 10° C./minute to about 25° C./minute to a temperature of about 900° C., and (d) holding said compacted material at about 900° C. to form a silver material having a density of at a temperature of least about 9.9 grams/cc.
Claim 3
Dependent Claim
171 words
A process for producing a two layer electrical contact comprising (a) forming a relatively uniform admixture consisting essentially of from about 1% by weight to about 15% by weight of silver oxide, from abut 10% by weight to about 20% by weight of silver acetate, balance silver powder, (b) forming a silver-cadmium oxide powder material consisting essentially of from about 5% by weight to about 20% by weight of cadmium oxide, balance silver, (c) partially filling a die with said Ag-CdO powder to a predetermined level, (d) completing the filling of said die with said admixture formed in step (a), (e) pressing the material in said die at a pressure of from about 8,000 psi to about 50,00 psi to form a green compact, (f) heating said green compact to increase its temperature at a rate of from about 10° C./minute to about 25° C./minute up to a temperature of about 900° C., and (g) holding said material at a temperature of about 900° C. for at least about 30 minutes.
Claim 4
Dependent Claim
171 words
A process for producing a two layer electrical contact comprising (a) forming a relatively uniform admixture consisting essentially of from about 1% by weight to about 15% by weight of silver oxide, from abut 10% by weight to about 20% by weight of silver acetate, balance silver powder, (b) forming a silver-cadmium oxide powder material consisting essentially of from about 5% by weight to about 20% by weight of cadmium oxide, balance silver, (c) partially filling a die with said Ag-CdO powder to a predetermined level, (d) completing the filling of said die with said admixture formed in step (a), (e) pressing the material in said die at a pressure of from about 8,000 psi to about 50,00 psi to form a green compact, (f) heating said green compact to increase its temperature at a rate of from about 10° C./minute to about 25° C./minute up to a temperature of about 900° C., and (g) holding said material at a temperature of about 900° C. for at least about 30 minutes.
Claim 5
Dependent Claim
29 words
An electric contact produced according to claim 2 wherein said contact has a distinct line of a reaction zone between the resulting silver layer and the silver-cadmium oxide layer.
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) | 1987-05-22 | 1987-11-21 | 1988-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-22 | 1991-11-21 | 1992-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-22 | 1995-11-21 | 1996-05-22 | $7700.00 | Window Closed / Lapsed |