Patent US3524711A successfully refreshed from Google Patents.
US3524711A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helicopter rotors
Assignee: TECHNOLOGY UK
•
Filing: 1968-05-13
•
Granted: 1970-08-18
•
Expires: 1988-05-13
Abstract
No abstract record available.
Inventors
- 👤 Ian Clifford Cheeseman
- 👤 James Eric George
- 👤 Charles Reginald Lawrence
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:08
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/32; B64C27/325; B64C27/54
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2556710A
Cited
US2650666A
Cited
US3211397A
Cited
US2925129A
Cited
DE1118612B
Cited
US3096041A
Cited
DE1130298B
Cited
US3139936A
Cited
US3349853A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-08-17 | 1974-02-16 | 1974-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-17 | 1978-02-16 | 1978-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-17 | 1982-02-16 | 1982-08-18 | $7700.00 | Window Closed / Lapsed |