Patent US2661171A successfully refreshed from Google Patents.
US2661171A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Up and down lock mechanism for retractable landing gear for aircraft
Assignee: Glenn L Martin Co
•
Filing: 1951-10-11
•
Granted: 1953-12-01
•
Expires: 1971-10-11
Abstract
No abstract record available.
Inventors
- 👤 John H Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:17
CPC Classifications
B; B64; B64C; B64C25/00; B64C25/02; B64C25/08; B64C25/10; B64C25/18; B64C25/26
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2294467A
Cited
US2371699A
Cited
US2374146A
Cited
US2464972A
Cited
US2391998A
Cited
US2562778A
Cited
US2504458A
Cited
GB652093A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-30 | 1957-06-01 | 1957-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-30 | 1961-06-01 | 1961-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-30 | 1965-06-01 | 1965-12-01 | $7700.00 | Window Closed / Lapsed |