Patent US2890309A successfully refreshed from Google Patents.
US2890309A
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Multiple break electric switch
Assignee: Allis Chalmers Corp
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Filing: 1957-06-26
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Granted: 1959-06-09
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Expires: 1977-06-26
Abstract
No abstract record available.
Inventors
- 👤 Charles R Peter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:10
CPC Classifications
H; H01; H01H; H01H9/00; H01H9/30; H01H9/44; H01H9/443; H01H50/00; H01H50/16; H01H50/18; H01H50/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US731375A
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USRE20094E
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US2239031A
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US2332446A
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US2506991A
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US2575060A
Cited
US2650971A
Cited
US2677032A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-06-08 | 1962-12-08 | 1963-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-06-08 | 1966-12-08 | 1967-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-06-08 | 1970-12-08 | 1971-06-09 | $7700.00 | Window Closed / Lapsed |