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US2646847A
Expired / Lapsed
US
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Control for aircraft gas-turbine power plants having variablepitch airscrews
Assignee: Rolls Royce PLC
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Filing: 1948-12-10
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Granted: 1953-07-28
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Expires: 1968-12-10
Abstract
No abstract record available.
Inventors
- 👤 Haworth Lionel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:08
CPC Classifications
B; B64; B64C; B64C11/00; B64C11/30; B64C11/38; B64C11/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2181985A
Cited
US2179492A
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US2346007A
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US2391629A
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US2402065A
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US2499813A
Cited
US2500811A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-27 | 1957-01-26 | 1957-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-27 | 1961-01-26 | 1961-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-27 | 1965-01-26 | 1965-07-28 | $7700.00 | Window Closed / Lapsed |