US3674446A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical contact material
Assignee: Duracell Inc USA
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Filing: 1969-10-13
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Granted: 1972-07-04
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Expires: 1989-10-13
Abstract
Abstract ELECTRICAL CONTACT MATERIAL CONSISTING ESSENTIALLY OF SILVER AND CADMIUM OXIDE IS DISCLOSED WHEREIN THE MATERIAL IS CHARACTERIZED BY HAVING A PRE-OXIDIZED MICROSTRUCTURE WHEREIN THERE IS A FINE CADMIUM OXIDE PARTICLE SIZE AND A SUBSTANTIALLY UNIFORM DISTRIBUTION OF CADMIUM OXIDE THROUGHOUT THE MATERIAL INCLUDING THE CORE. THE MATERIAL HAS A LOWER ARC EROSION RATE THAN POST OXIDIZED MATERIAL OF THE SAME COMPOSITION WHEN TESTED UNDER SIMILAR CONDITIONS. A BACKING, FOR EXAMPLE OF FINE SILVER MAY BE PROVIDED FOR THE CONTACT MATERIAL.
Inventors
- 👤 Fredrik O Haarbye
- 👤 Peter C Murphy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:10
CPC Classifications
H; H01; H01H; H01H1/00; H01H1/02; H01H1/021; H01H1/023; H01H1/0231; C; C22; C22C; C22C32/00; C22C32/001; C22C32/0015; C22C32/0021; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/923; Y10S428/924; Y10S428/926; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12063; Y10T428/12139; Y10T428/12493; Y10T428/1266; Y10T428/12667; Y10T428/12771; Y10T428/12861; Y10T428/12896
Claims Analysis
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |