US3552881A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Construction of rotor blades for rotary wing aircraft
Assignee: Westland Group PLC
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Filing: 1968-07-05
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Granted: 1971-01-05
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Expires: 1988-07-05
Abstract
Abstract THIS INVENTION RELATES TO THE CONSTRUCTION OF ROTOR BLADES FOR ROTARY WING AIRCRAFT, AND IN PARTICULAR, HELICOPTERS.
Inventors
- 👤 Victor A B Rogers
- 👤 Anthony B D Leigh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:28
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/32; B64C27/46; B64C27/473; B64C2027/4733; B64C2027/4736
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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |