Patent US3667863A successfully refreshed from Google Patents.
US3667863A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotor hub and blade attachments
Assignee: Individual
•
Filing: 1970-02-03
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Granted: 1972-06-06
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Expires: 1990-02-03
Abstract
Abstract THIS INVENTION RELATES TO AN IMPROVED ATTACHMENT FOR A ROTOR BLADE IN A ROTATING WING AIRCRAFT HAVING A SEMIRIGID ROTOR SYSTEM. MORE PARTICULARLY, THE INVENTION PROVIDES A LOW COST, LIGHTWEIGHT, LOW MAINTENANCE ROTOR SYSTEM EMBODYING ALL OF THE DESIRED CHARACTERISTICS OF THE SEMI-RIGID HUB BUT WITH A MINIMUM CHANCE OF FATIGUE OR FAILURE.
Inventors
- 👤 Gerald L Breuner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:26
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/32; B64C27/46; B64C27/473; B64C27/48
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) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |