US2468913A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Airplane and helicopter sustained aircraft
Assignee: Individual
•
Filing: 1943-11-22
•
Granted: 1949-05-03
•
Expires: 1963-11-22
Abstract
No abstract record available.
Inventors
- 👤 Harold T Avery
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:31
CPC Classifications
B; B64; B64C; B64C29/00; B64C29/0008; B64C29/0016; B64C29/0033
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1865744A
Cited
US1951817A
Cited
FR810054A
Cited
US2230370A
Cited
US2321572A
Cited
US2284902A
Cited
US2352342A
Cited
US2352404A
Cited
US2376523A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-05-02 | 1952-11-01 | 1953-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-05-02 | 1956-11-01 | 1957-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-05-02 | 1960-11-01 | 1961-05-03 | $7700.00 | Window Closed / Lapsed |