Patent US2640550A successfully refreshed from Google Patents.
US2640550A
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US
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Turbine propeller control system
Assignee: Curtiss Wright Corp
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Filing: 1948-07-24
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Granted: 1953-06-02
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Expires: 1968-07-24
Abstract
No abstract record available.
Inventors
- 👤 George P Knapp
- 👤 William E Burns
- 👤 William P Robbins
- 👤 Raymond T Zwack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:33
CPC Classifications
F; F02; F02C; F02C9/00; F02C9/48; F02C9/56; F02C9/58
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1374786A
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US2231292A
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US2292288A
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US2306953A
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US2322303A
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US2352786A
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US2300419A
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US2293912A
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US2391323A
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US2446658A
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US2432320A
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US2525460A
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US2457595A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-01 | 1956-12-01 | 1957-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-01 | 1960-12-01 | 1961-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-01 | 1964-12-01 | 1965-06-02 | $7700.00 | Window Closed / Lapsed |