Patent US2855054A successfully refreshed from Google Patents.
US2855054A
Expired / Lapsed
US
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Speed control system for reversible pitch aircraft propellers
Assignee: Bristol Aircraft Ltd
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Filing: 1954-01-11
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Granted: 1958-10-07
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Expires: 1974-01-11
Abstract
No abstract record available.
Inventors
- 👤 Morgan William George
- 👤 Robinson Harry Edgar William
- 👤 Verrier Frank William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:48
CPC Classifications
B; B64; B64C; B64C11/00; B64C11/30; B64C11/32; B64C11/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2678103A
Cited
US2664959A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-06 | 1962-04-07 | 1962-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-06 | 1966-04-07 | 1966-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-06 | 1970-04-07 | 1970-10-07 | $7700.00 | Window Closed / Lapsed |