US2531976A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Retractable lift rotor mechanism for aircraft
Assignee: Individual
•
Filing: 1946-09-13
•
Granted: 1950-11-28
•
Expires: 1966-09-13
Abstract
No abstract record available.
Inventors
- 👤 Garrett Harley Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:31
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/22; B64C27/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR409193A
Cited
US1715303A
Cited
US1861336A
Cited
US1982968A
Cited
US2380580A
Cited
US2330803A
Cited
US2135073A
Cited
US2464285A
Cited
US2395143A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-27 | 1954-05-29 | 1954-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-27 | 1958-05-29 | 1958-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-27 | 1962-05-29 | 1962-11-28 | $7700.00 | Window Closed / Lapsed |