Patent US20070129670A1 successfully refreshed from Google Patents.
US2761648A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotor blade locking device
Assignee: AV Roe Canada Ltd
•
Filing: 1951-09-18
•
Granted: 1956-09-04
•
Expires: 1971-09-18
Abstract
No abstract record available.
Inventors
- 👤 Purvis Joseph Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:41
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/30; F01D5/32; F01D5/323; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49908; Y10T29/49915
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1046986A
Cited
US1070385A
Cited
US1149658A
Cited
US1237515A
Cited
US1574619A
Cited
US2317347A
Cited
US2297770A
Cited
US2434935A
Cited
GB620877A
Cited
FR976790A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-09-04 | 1960-03-05 | 1960-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-04 | 1964-03-05 | 1964-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-04 | 1968-03-05 | 1968-09-04 | $7700.00 | Window Closed / Lapsed |