Patent US2786774A successfully refreshed from Google Patents.
US2664477A
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Intermittently operating direction responsive switch
Assignee: B F MCDONALD Co
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Filing: 1950-03-27
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Granted: 1953-12-29
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Expires: 1970-03-27
Abstract
No abstract record available.
Inventors
- 👤 Howard B Lewis
- 👤 Jr Howard Field
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:26
CPC Classifications
H; H01; H01H; H01H35/00; H01H35/06; H01H35/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1566888A
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US2038323A
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US2145634A
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US2116342A
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US2186765A
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US2427453A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-12-28 | 1957-06-29 | 1957-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-28 | 1961-06-29 | 1961-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-28 | 1965-06-29 | 1965-12-29 | $7700.00 | Window Closed / Lapsed |