Patent US3005931A successfully refreshed from Google Patents.
Patent US3131486A successfully refreshed from Google Patents.
US3131486A
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Rotorcraft training device
Assignee: Boelkow Entwicklungen KG
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Filing: 1960-05-20
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Granted: 1964-05-05
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Expires: 1980-05-20
Abstract
No abstract record available.
Inventors
- 👤 Derschmidt Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:03
CPC Classifications
G; G09; G09B; G09B9/00; G09B9/02; G09B9/08; G09B9/46
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
HELICOPTER TRAINING APPARATUS COMPRISING A HELICOPTER FUSELAGE WITH A SEAT, A PROPULSION UNIT IN SAID FUSELAGE, A MAIN ROTOR DRIVEN BY THE PROPULSION UNIT, A TAIL ROTOR DRIVEN BY THE PROPULSION UNIT, CONTROL MEANS FOR INFLUENCING THE MAIN ROTOR AND THE TAIL ROTOR, AN UNDERFRAME, A SUPPORT FOR THE UNDERFRAME, MEANS CONNECTING THE HELICOPTER FUSELAGE TO THE UNDERFRAME, MEANS PERMITTING A ROTARY MOVEMENT OF THE UNDERFRAME AND HELICOPTER FUSELAGE WITH RESPECT TO THE SUPPORT ABOUT A VERTICAL AXIS OF ROTATION, AND LOCKING MEANS FOR CONTROLLING THIS ROTARY MOVEMENT OF THE UNDERFRAME AND HELICOPTER FUSELAGE WITH RESPECT TO THE SUPPORT.
Claim 2
Dependent Claim
99 words
HELICOPTER TRAINING APPARATUS COMPRISING A HELICOPTER FUSELAGE WITH A SEAT, A PROPULSION UNIT IN SAID FUSELAGE, A MAIN ROTOR DRIVEN BY THE PROPULSION UNIT, A TAIL ROTOR DRIVEN BY THE PROPULSION UNIT, CONTROL MEANS FOR INFLUENCING THE MAIN ROTOR AND THE TAIL ROTOR, AN UNDERFRAME, A SUPPORT FOR THE UNDERFRAME, MEANS CONNECTING THE HELICOPTER FUSELAGE TO THE UNDERFRAME, MEANS PERMITTING A ROTARY MOVEMENT OF THE UNDERFRAME AND HELICOPTER FUSELAGE WITH RESPECT TO THE SUPPORT ABOUT A VERTICAL AXIS OF ROTATION, AND LOCKING MEANS FOR CONTROLLING THIS ROTARY MOVEMENT OF THE UNDERFRAME AND HELICOPTER FUSELAGE WITH RESPECT TO THE SUPPORT.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-05-05 | 1967-11-04 | 1968-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-05 | 1971-11-04 | 1972-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-05 | 1975-11-04 | 1976-05-05 | $7700.00 | Window Closed / Lapsed |