US2609056A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Controllable pitch propeller
Assignee: Individual
•
Filing: 1945-01-04
•
Granted: 1952-09-02
•
Expires: 1965-01-04
Abstract
No abstract record available.
Inventors
- 👤 Allan H Lockheed
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:57
CPC Classifications
B; B64; B64C; B64C11/00; B64C11/30; B64C11/32; B64C11/36
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1427178A
Cited
US1378401A
Cited
US1799828A
Cited
US1719953A
Cited
US1776650A
Cited
US1793654A
Cited
US1875598A
Cited
US2127687A
Cited
US1857392A
Cited
US2007417A
Cited
US2033342A
Cited
US2000049A
Cited
GB445652A
Cited
US2181985A
Cited
US2144927A
Cited
US2138339A
Cited
US2306135A
Cited
US2314025A
Cited
US2362914A
Cited
US2327217A
Cited
US2372667A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-09-02 | 1956-03-03 | 1956-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-09-02 | 1960-03-03 | 1960-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-09-02 | 1964-03-03 | 1964-09-02 | $7700.00 | Window Closed / Lapsed |