Patent US2439206A successfully refreshed from Google Patents.
US2439206A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control surface lock for aircraft
Assignee: Douglas Aircraft Co Inc
•
Filing: 1942-11-16
•
Granted: 1948-04-06
•
Expires: 1962-11-16
Abstract
No abstract record available.
Inventors
- 👤 Farr Alton Edwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:23
CPC Classifications
B; B64; B64C; B64C13/00; B64C13/24; B64C13/26; B64C13/28; B64C13/30; Y; Y10; Y10T; Y10T74/00; Y10T74/20; Y10T74/20576; Y10T74/20636; Y10T74/20666
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US289949A
Cited
US366774A
Cited
US1747344A
Cited
US2069047A
Cited
US2054970A
Cited
US2035231A
Cited
US2245252A
Cited
US2280246A
Cited
US2260481A
Cited
US2280809A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-04-06 | 1951-10-06 | 1952-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-04-06 | 1955-10-06 | 1956-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-04-06 | 1959-10-06 | 1960-04-06 | $7700.00 | Window Closed / Lapsed |