US2491260A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pitch control mechanism for helicopters
Assignee: Individual
•
Filing: 1945-07-06
•
Granted: 1949-12-13
•
Expires: 1965-07-06
Abstract
No abstract record available.
Inventors
- 👤 Albert A Green
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:00
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US895820A
Cited
US2068617A
Cited
US2020366A
Cited
US2153610A
Cited
US2296892A
Cited
US2312376A
Cited
US2378967A
Cited
US2396590A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-12 | 1953-06-13 | 1953-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-12 | 1957-06-13 | 1957-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-12 | 1961-06-13 | 1961-12-13 | $7700.00 | Window Closed / Lapsed |