Patent US4131458A successfully refreshed from Google Patents.
US4131458A
Expired / Lapsed
US
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Electrical contact material of silver base alloy
Assignee: National Institute for Materials Science
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Filing: 1977-10-18
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Granted: 1978-12-26
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Expires: 1997-10-18
Abstract
Abstract An electrical contact material consisting essentially of silver and a small amount of zinc oxide, tellurium oxide, and optionally indium oxide and tin oxide, these oxides being uniformly dispersed in the silver matrix.
Inventors
- 👤 Mitsunori Satoh
- 👤 Masayuki Hijikata
- 👤 Hiroshi Maeda
- 👤 Ichiro Morimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:01
CPC Classifications
H; H01; H01H; H01H1/00; H01H1/02; H01H1/021; H01H1/023; H01H1/0237; H01H1/02372
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
53 words
An electrical contact material consisting essentially of silver and uniformly dispersed in the silver, (a) 1 to 12 atomic % of zinc oxide and (b) 0.1 to 1 atomic % of tellurium oxide, the total amount of (a) and (b) being 2 to 13 atomic %, and all amounts being calculated as metal.
Claim 2
Dependent Claim
53 words
An electrical contact material consisting essentially of silver and uniformly dispersed in the silver, (a) 1 to 12 atomic % of zinc oxide and (b) 0.1 to 1 atomic % of tellurium oxide, the total amount of (a) and (b) being 2 to 13 atomic %, and all amounts being calculated as metal.
Claim 3
Dependent Claim
76 words
An electrical contact material consisting essentially of silver and uniformly dispersed in the silver, (a) 1 to 12 atomic % of zinc oxide, (b) 0.1 to 1 atomic % of tellurium oxide, and (c) at least one of 0.3 to 8 atomic % of indium oxide and 0.3 to 3 atomic % of tin oxide, the total amount of (a), (b) and (c) being 2 to 12 atomic %, and all amounts being calculated as metal.
Claim 4
Dependent Claim
76 words
An electrical contact material consisting essentially of silver and uniformly dispersed in the silver, (a) 1 to 12 atomic % of zinc oxide, (b) 0.1 to 1 atomic % of tellurium oxide, and (c) at least one of 0.3 to 8 atomic % of indium oxide and 0.3 to 3 atomic % of tin oxide, the total amount of (a), (b) and (c) being 2 to 12 atomic %, and all amounts being calculated as metal.
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) | 1981-12-25 | 1982-06-26 | 1982-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-25 | 1986-06-26 | 1986-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-25 | 1990-06-26 | 1990-12-26 | $7700.00 | Window Closed / Lapsed |