Patent CH475876A successfully refreshed from Google Patents.
US3933486A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver-metal oxide composite and method of manufacturing the same
Assignee: Chugai Electric Industrial Co Ltd
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Filing: 1974-05-30
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Granted: 1976-01-20
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Expires: 1994-05-30
Abstract
Abstract An electrical contact material obtained through internally oxidizing a silver alloy which is the solid solution with 5 to 20 weight percent of one or more of the solute metal elements selected from tin, zinc and antimony and which contains 0.01 to 1.0% weight percent of bismuth. The silver alloy may also include up to 0.5 weight percent of ferrous metal or metals.
Inventors
- 👤 Akira Shibata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:41
CPC Classifications
H; H01; H01H; H01H1/00; H01H1/02; H01H1/021; H01H1/023; H01H1/0237; H01H1/02372; C; C22; C22C; C22C5/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
63 words
An electrical contact material obtained by internally oxidizing an alloy of silver and solute metal elements, said alloy comprising a silver matrix, 5 to 20 weight percent of one or more of solute metal elements selected from the group consisting of tin, zinc, and antimony, and as an essential material, 0.01 to 1.0 weight percent of bismuth precipitated in the alloy as oxides.
Claim 2
Dependent Claim
63 words
An electrical contact material obtained by internally oxidizing an alloy of silver and solute metal elements, said alloy comprising a silver matrix, 5 to 20 weight percent of one or more of solute metal elements selected from the group consisting of tin, zinc, and antimony, and as an essential material, 0.01 to 1.0 weight percent of bismuth precipitated in the alloy as oxides.
Claim 3
Dependent Claim
47 words
The material as claimed in claim 1 wherein the maximum diameter of the grain boundaries of the silver matrix is less than 50 μ, and thin films of the oxides of tin, zinc or antimony and of the oxides of bismuth are precipitated in said grain boundaries.
Claim 4
Dependent Claim
17 words
The material as claimed in claim 1 further containing less than 0.5 weight percent of ferrous metals.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-19 | 1979-07-21 | 1980-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-19 | 1983-07-21 | 1984-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-19 | 1987-07-21 | 1988-01-20 | $7700.00 | Window Closed / Lapsed |