Patent US2664960A successfully refreshed from Google Patents.
US2664960A
Expired / Lapsed
US
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Topping governor and reversing solenoid for variable pitch propellers
Assignee: RTX Corp
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Filing: 1950-07-29
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Granted: 1954-01-05
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Expires: 1970-07-29
Abstract
No abstract record available.
Inventors
- 👤 Melvin E Longfellow
- 👤 Nelson R Richmond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:06
CPC Classifications
B; B64; B64C; B64C11/00; B64C11/30; B64C11/303
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1874714A
Cited
US2423191A
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US2410659A
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US2424559A
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US2474144A
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US2491172A
Cited
US2502041A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-04 | 1957-07-06 | 1958-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-04 | 1961-07-06 | 1962-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-04 | 1965-07-06 | 1966-01-05 | $7700.00 | Window Closed / Lapsed |