Patent US3280918A successfully refreshed from Google Patents.
US3280918A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotor construction
Assignee: Bell Aerospace Corp
•
Filing: 1965-04-26
•
Granted: 1966-10-25
•
Expires: 1985-04-26
Abstract
No abstract record available.
Inventors
- 👤 Drees Jan Meijer
- 👤 Robert W Metzger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:30
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/54
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
IN A ROTARY WING AIRCRAFT, IN COMBINATION, A PLURALITY OF ROTOR BLADES, A ROTOR DRIVING MEMBER, A ROTOR HUB HAVING A CENTRAL PORTION ATTACHED TO SAID ROTOR DRIVING MEMBER AND A BLADE-MOUNTING EXTENTION FOR EACH OF SAID ROTOR BLADES, EACH ROTOR BLADE HAVING AN ELONGATE INNER END PORTION DISPOSED AT LEAST PREDOMINANTLY IN CHORDWISE SIDEBY-SIDE RELATION TO A CORRESPONDING BLADE-MOUNTING EXTENTION, BEARING MEANS PIVOTALLY CONNECTING EACH BLADE-MOUNTING EXTENSION TO AN INNER END PORTION OF A CORRESPONDING ROTOR BLADE ABOUT AN AXIS EXTENDING LONGITUDINALLY WITH RESPECT TO THE CORRESPONDING ROTOR BLADE.
Claim 2
Dependent Claim
90 words
IN A ROTARY WING AIRCRAFT, IN COMBINATION, A PLURALITY OF ROTOR BLADES, A ROTOR DRIVING MEMBER, A ROTOR HUB HAVING A CENTRAL PORTION ATTACHED TO SAID ROTOR DRIVING MEMBER AND A BLADE-MOUNTING EXTENTION FOR EACH OF SAID ROTOR BLADES, EACH ROTOR BLADE HAVING AN ELONGATE INNER END PORTION DISPOSED AT LEAST PREDOMINANTLY IN CHORDWISE SIDEBY-SIDE RELATION TO A CORRESPONDING BLADE-MOUNTING EXTENTION, BEARING MEANS PIVOTALLY CONNECTING EACH BLADE-MOUNTING EXTENSION TO AN INNER END PORTION OF A CORRESPONDING ROTOR BLADE ABOUT AN AXIS EXTENDING LONGITUDINALLY WITH RESPECT TO THE CORRESPONDING ROTOR BLADE.
References Cited (Backward Citations)
FR983938A
Cited
US2580363A
Cited
US2689011A
Cited
US2845131A
Cited
GB751109A
Cited
US2829721A
Cited
US2830669A
Cited
US2961051A
Cited
US2949965A
Cited
US3026942A
Cited
US3077934A
Cited
US3193018A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-24 | 1970-04-25 | 1970-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-24 | 1974-04-25 | 1974-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-24 | 1978-04-25 | 1978-10-25 | $7700.00 | Window Closed / Lapsed |