US2486016A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screw propeller
Assignee: Rotol Ltd
•
Filing: 1944-08-18
•
Granted: 1949-10-25
•
Expires: 1964-08-18
Abstract
No abstract record available.
Inventors
- 👤 Fairhurst Leonard Gaskell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 00:16
CPC Classifications
B; B64; B64C; B64C11/00; B64C11/30; B64C11/38; B64C11/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB463985A
Cited
US2132481A
Cited
US2280713A
Cited
GB519261A
Cited
US2258094A
Cited
GB536816A
Cited
GB546291A
Cited
US2341730A
Cited
US2377457A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-10-24 | 1953-04-25 | 1953-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-10-24 | 1957-04-25 | 1957-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-10-24 | 1961-04-25 | 1961-10-25 | $7700.00 | Window Closed / Lapsed |