US2981338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Locking device for propeller blades
Assignee: Individual
•
Filing: 1958-04-14
•
Granted: 1961-04-25
•
Expires: 1978-04-14
Abstract
No abstract record available.
Inventors
- 👤 Hindmarch Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 03:27
CPC Classifications
B; B63; B63H; B63H3/00; B63H3/06; B63H3/08; B63H3/081; B63H3/082; B63H2003/004
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1867715A
Cited
US1846488A
Cited
US1846600A
Cited
US1891272A
Cited
FR769152A
Cited
DE671693C
Cited
US2319335A
Cited
US2433990A
Cited
US2660252A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-24 | 1964-10-24 | 1965-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-24 | 1968-10-24 | 1969-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-24 | 1972-10-24 | 1973-04-25 | $7700.00 | Window Closed / Lapsed |