US2437188A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-contained variable pitch propeller unit
Assignee: Fairey Aviation Co Ltd
•
Filing: 1943-01-19
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Granted: 1948-03-02
•
Expires: 1963-01-19
Abstract
No abstract record available.
Inventors
- 👤 Forsyth Archibald Graham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:37
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)
GB239801A
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US2127687A
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US2086097A
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US2123057A
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US2250694A
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FR844172A
Cited
US2314025A
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US2305146A
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US2327217A
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US2316438A
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US2346007A
Cited
US2334967A
Cited
US2293912A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-03-02 | 1951-09-01 | 1952-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-03-02 | 1955-09-01 | 1956-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-03-02 | 1959-09-01 | 1960-03-02 | $7700.00 | Window Closed / Lapsed |