US2269833A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Propeller
Assignee: Individual
•
Filing: 1941-01-11
•
Granted: 1942-01-13
•
Expires: 1961-01-11
Abstract
No abstract record available.
Inventors
- 👤 Upton Clayton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:26
CPC Classifications
B; B63; B63H; B63H3/00; B63H3/02; B63H3/04; B64; B64C; B64C11/00; B64C11/30; B64C11/32; B64C11/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1945-01-12 | 1945-07-14 | 1946-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-01-12 | 1949-07-14 | 1950-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-01-12 | 1953-07-14 | 1954-01-13 | $7700.00 | Window Closed / Lapsed |