Patent US3079531A successfully refreshed from Google Patents.
US3079531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aircraft propeller engine speed controls
Assignee: De Havilland Aircraft Co Ltd
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Filing: 1958-08-13
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Granted: 1963-02-26
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Expires: 1978-08-13
Abstract
No abstract record available.
Inventors
- 👤 Tugwood Brian Richard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:19
CPC Classifications
H; H02; H02P; H02P5/00; H02P5/46; H02P5/52; B; B64; B64C; B64C11/00; B64C11/46; B64C11/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
IN AN AIRCRAFT PROPELLER ENGINE SPEED CONTROL INCLUDING A SERVO MOTOR TO EFFECT ACTUAL SPEED CONTROL ON THE ENGINE IN RESPONSE TO SIGNALS DERIVED FROM A CONTROL DEVICE RESPONSIVE TO SPEED ERROR, AN ELECTRICAL FEEDBACK DEVICE COMPRISING ONE STATOR HAVING A WINDING CONNECTED TO AN ENERGIZING SUPPLY OF SINGLE PHASE ALTERNATING CURRENT, A SECOND STATOR HAVING A MULTI-PHASE WINDING FROM WHICH A MULTI-PHASE IN SPACE SIGNAL IS OBTAINED, THE RELATIVE AMPLITUDES OF SAID MULTIPHASE IN SPACE SIGNAL BEING INDICATIVE OF THE POSITION AND THE SPACE FREQUENCY OF THE RATE OF MOVEMENT OF THE SERVO MOTOR, AND A ROTOR COOPERATING WITH EACH STATOR, THE ROTORS HAVING ELECTRICALLY IN-
Claim 2
Dependent Claim
107 words
IN AN AIRCRAFT PROPELLER ENGINE SPEED CONTROL INCLUDING A SERVO MOTOR TO EFFECT ACTUAL SPEED CONTROL ON THE ENGINE IN RESPONSE TO SIGNALS DERIVED FROM A CONTROL DEVICE RESPONSIVE TO SPEED ERROR, AN ELECTRICAL FEEDBACK DEVICE COMPRISING ONE STATOR HAVING A WINDING CONNECTED TO AN ENERGIZING SUPPLY OF SINGLE PHASE ALTERNATING CURRENT, A SECOND STATOR HAVING A MULTI-PHASE WINDING FROM WHICH A MULTI-PHASE IN SPACE SIGNAL IS OBTAINED, THE RELATIVE AMPLITUDES OF SAID MULTIPHASE IN SPACE SIGNAL BEING INDICATIVE OF THE POSITION AND THE SPACE FREQUENCY OF THE RATE OF MOVEMENT OF THE SERVO MOTOR, AND A ROTOR COOPERATING WITH EACH STATOR, THE ROTORS HAVING ELECTRICALLY IN-
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) | 1966-02-25 | 1966-08-27 | 1967-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-02-25 | 1970-08-27 | 1971-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-02-25 | 1974-08-27 | 1975-02-26 | $7700.00 | Window Closed / Lapsed |