US2461967A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aerodynamic retarder
Assignee: Douglas Aircraft Co Inc
•
Filing: 1945-12-26
•
Granted: 1949-02-15
•
Expires: 1965-12-26
Abstract
No abstract record available.
Inventors
- 👤 Leo J Devlin
- 👤 Edward H Heinemann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:29
CPC Classifications
B; B64; B64D; B64D27/00; B64D27/02; B64D27/023
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1875465A
Cited
US1157636A
Cited
US1359590A
Cited
US1567229A
Cited
US1710938A
Cited
US1875593A
Cited
US2015444A
Cited
GB523990A
Cited
US2189553A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-02-15 | 1952-08-16 | 1953-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-02-15 | 1956-08-16 | 1957-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-02-15 | 1960-08-16 | 1961-02-15 | $7700.00 | Window Closed / Lapsed |