US2461791A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable pitch airscrew
Assignee: De Havilland Aircraft Co Ltd
•
Filing: 1943-08-02
•
Granted: 1949-02-15
•
Expires: 1963-08-02
Abstract
No abstract record available.
Inventors
- 👤 Warde Robert Henry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:22
CPC Classifications
B; B64; B64C; B64C11/00; B64C11/30; B64C11/38; B64C11/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2204640A
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US2154887A
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US2216416A
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US2174717A
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GB483824A
Cited
US2243852A
Cited
GB517696A
Cited
US2264089A
Cited
GB541839A
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US2338483A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-02-15 | 1952-08-16 | 1953-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-02-15 | 1956-08-16 | 1957-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-02-15 | 1960-08-16 | 1961-02-15 | $7700.00 | Window Closed / Lapsed |