US3966464A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical contact materials and methods of making the same
Assignee: Schneider Electric USA Inc
•
Filing: 1974-11-25
•
Granted: 1976-06-29
•
Expires: 1994-11-25
Abstract
Abstract The contact materials comprise silver with additions of mercury or mercury and tellurium and silver-cadmium oxide compositions with additions of mercury and tellurium. The methods of making the materials include the steps of adding a silver-mercury alloy to molten silver and to a molten silver-tellurium powder mixture. The materials including cadmium oxide are produced by heating a mixture of powders of silver, a cadmium-tellurium compound, cadmium oxide, and mercuric oxide powders in a reducing atmosphere and then reoxidizing.
Inventors
- 👤 Terrence Ardern Davies
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:42
CPC Classifications
H; H01; H01H; H01H1/00; H01H1/02; H01H1/021; H01H1/023; H01H1/0237; C; C22; C22C; C22C1/00; C22C1/02; C22C1/03; H01B; H01B1/00; H01B1/02; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4998; Y10T29/49988
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
64 words
A method of producing an electrical contact material including the steps providing a silver-mercury master alloy of a desired composition; adding the master alloy to molten silver under an inert atmosphere to provide a silver-based molten alloy having a mercury concentration of not more than 3.0 weight percent; casting molten alloy to form an ingot; and forging and rolling the ingot into sheet form.
Claim 2
Independent Claim
64 words
A method of producing an electrical contact material including the steps providing a silver-mercury master alloy of a desired composition; adding the master alloy to molten silver under an inert atmosphere to provide a silver-based molten alloy having a mercury concentration of not more than 3.0 weight percent; casting molten alloy to form an ingot; and forging and rolling the ingot into sheet form.
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) | 1979-06-29 | 1979-12-29 | 1980-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-29 | 1983-12-29 | 1984-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-29 | 1987-12-29 | 1988-06-29 | $7700.00 | Window Closed / Lapsed |