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Patent US2810840A successfully refreshed from Google Patents.
US2810840A
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Current-actuated a.-c. relay sensing system and engine-generator idling device employing same
Assignee: Individual
•
Filing: 1956-12-26
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Granted: 1957-10-22
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Expires: 1976-12-26
Abstract
No abstract record available.
Inventors
- 👤 William E Mcfarland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:38
CPC Classifications
H; H02; H02H; H02H1/00; H02H1/0007; H01; H01H; H01H47/00; H01H47/001
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US714891A
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US1204507A
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US1698289A
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US1940335A
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US2242072A
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US2313306A
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US2396176A
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US2503483A
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US2488171A
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US2649557A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-21 | 1961-04-22 | 1961-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-21 | 1965-04-22 | 1965-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-21 | 1969-04-22 | 1969-10-22 | $7700.00 | Window Closed / Lapsed |