Patent US3112901A successfully refreshed from Google Patents.
US3112901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Propeller control system
Assignee: Curtiss Wright Corp
•
Filing: 1961-06-02
•
Granted: 1963-12-03
•
Expires: 1981-06-02
Abstract
No abstract record available.
Inventors
- 👤 Wayne E Kohman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:49
CPC Classifications
B; B64; B64C; B64C11/00; B64C11/46; B64C29/00; B64C29/0008; B64C29/0016; B64C29/0033
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
116 words
IN A VTOL AIRCRAFT HAVING A TILTABLE ENGINE DRIVEN PROPELLER WHICH INCLUDES PITCH CHANGING MECHANISM FOR VARYING PROPELLER BLADE ANGLE, THE COMBINATION COMPRISING AN ENGINE DRIVEN GOVERNOR, AN ACTUATOR RESPONSIVE TO OPERATION OF THE GOVERNOR FOR CONTROLLING THE PITCH CHANGING MECHANISM TO MAINTAIN CONSTANT THE SPEED OF THE PROPELLERS, MEANS OPERATIVELY CONNECTED TO THE ACTUATOR PROVIDING FOR AN INCREMENT OF BLADE ANGLE CHANGE AT ONE RATE AND ADDITIONAL BLADE ANGLE CHANGE AT A LESSER RATE, MEANS FOR MANUALLY CONTROLLING BLADE ANGLE IN THE EVENT OF A FAILURE OF GOVERNOR CONTROL, AND A SUMMING DEVICE BETWEEN THE ACTUATOR AND THE PITCH CHANGING MECHANISM INCLUDING A PLURALITY OF INPUT MEMBERS ONE OF WHICH IS RESPONSIVE TO ACTUATOR MOVEMENTS.
References Cited (Backward Citations)
US2590340A
Cited
US2284902A
Cited
US2478847A
Cited
GB603487A
Cited
US2557679A
Cited
US2849072A
Cited
US3073547A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-12-02 | 1967-06-03 | 1967-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-12-02 | 1971-06-03 | 1971-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-12-02 | 1975-06-03 | 1975-12-03 | $7700.00 | Window Closed / Lapsed |