US3288227A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helicopter rotor system
Assignee: Bolkow GmbH
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Filing: 1965-05-18
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Granted: 1966-11-29
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Expires: 1985-05-18
Abstract
No abstract record available.
Inventors
- 👤 Derschmidt Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:45
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/82; B64C27/22; B64C27/30; B64C27/54; B64C27/58; B64C27/59; Y; Y10; Y10S; Y10S416/00; Y10S416/50
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
132 words
DEVICE FOR THE LONGITUDINAL STABILIZATION OF ROTARY WING AIRCRAFT HAVING AN INCLINABLE ROTOR HEAD, ROTOR BLADES ANGULARLY ADJUSTABLE ON THE ROTOR HEAD AND A DISPLACEABLE SWASH PLATE CONTROLLING THE PITCH ANGLE OF THE ROTOR BLADES, SAID DEVICE COMPRISING, IN COMBINATION, SUBSTANTIALLY RECTILINEAR ROD MEANS CONNECTED AT ONE END TO SAID ROTOR HEAD; LEVER MEANS CONNECTED BETWEEN SAID SWASH PLATE AND THE OTHER END OF SAID ROD MEANS; RESILIENT MEANS INTERPOSITIONED IN SAID ROD MEANS AND PROVIDING FOR RELATIVE RECTILINEAR DISPLACEMENT OF THE ENDS OF THE LATTER TOWARDS AND AWAY FROM EACH OTHER; AND DAMPING MEANS CONNECTED TO SAID OTHER END OF SAID ROD MEANS AND CONNECTED TO THE AIRCRAFT FUSELAGE; SAID DAMPING MEANS HAVING A RESISTANCE TO RELATIVE RAPID DISPLACEMENT OF SAID ROD MEANS GREATER THAN THE BIAS OF SAID RESILIENT MEANS.
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) | 1969-11-28 | 1970-05-30 | 1970-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-28 | 1974-05-30 | 1974-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-28 | 1978-05-30 | 1978-11-29 | $7700.00 | Window Closed / Lapsed |