US3121832A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Push-pull control for constant speed motor
Assignee: Motors Liquidation Co
•
Filing: 1959-07-30
•
Granted: 1964-02-18
•
Expires: 1979-07-30
Abstract
No abstract record available.
Inventors
- 👤 John W Haskell
- 👤 John T Lahti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:24
CPC Classifications
H; H02; H02P; H02P25/00; H02P25/02; H02P25/022; H02P25/024
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
A CONSTANT SPEED DEVICE INCLUDING, A DIRECT CURRENT POWER SUPPLY, A FREQUENCY STANDARD SOURCE ENERGIZED FROM SAID POWER SUPPLY AND HAVING A CONSTANT FREQUENCY SINGLEENDED OUTPUT SIGNAL, A FIRST AMPLIFIER STAGE INCLUDING AN OUTPUT TRANSISTOR HAVING AN INPUT SIGNAL COMPRISING SAID SINGLE-ENDED SIGNAL, A PUSH-PULL AMPLIFIER STAGE CONNECTED TO THE OUTPUT OF SAID FIRST AMPLIFIER STAGE, MEANS COUPLING SAID FIRST AMPLIFIER STAGE AND SAID PUSH-PULL AMPLIFIER STAGE INCLUDING A ZENER DIODE CONNECTED IN THE COLLECTOR CIRCUIT OF SAID OUTPUT TRANSISTOR AND HAVING A BREAKDOWN VOLTAGE EXCEEDING THE OUTPUT VOLTAGE OF SAID FIRST AMPLIFIER STAGE WHEN IT IS CONDUCTIVE, AND A SYNCHRONOUS MOTOR HAVING A FIELD WINDING ENERGIZED BY THE OUTPUT OF SAID PUSH-PULL AMPLIFIER STAGE SO AS TO BE ENERGIZED FOR CONSTANT SPEED ROTATION.
Claim 2
Dependent Claim
124 words
A CONSTANT SPEED DEVICE INCLUDING, A DIRECT CURRENT POWER SUPPLY, A FREQUENCY STANDARD SOURCE ENERGIZED FROM SAID POWER SUPPLY AND HAVING A CONSTANT FREQUENCY SINGLEENDED OUTPUT SIGNAL, A FIRST AMPLIFIER STAGE INCLUDING AN OUTPUT TRANSISTOR HAVING AN INPUT SIGNAL COMPRISING SAID SINGLE-ENDED SIGNAL, A PUSH-PULL AMPLIFIER STAGE CONNECTED TO THE OUTPUT OF SAID FIRST AMPLIFIER STAGE, MEANS COUPLING SAID FIRST AMPLIFIER STAGE AND SAID PUSH-PULL AMPLIFIER STAGE INCLUDING A ZENER DIODE CONNECTED IN THE COLLECTOR CIRCUIT OF SAID OUTPUT TRANSISTOR AND HAVING A BREAKDOWN VOLTAGE EXCEEDING THE OUTPUT VOLTAGE OF SAID FIRST AMPLIFIER STAGE WHEN IT IS CONDUCTIVE, AND A SYNCHRONOUS MOTOR HAVING A FIELD WINDING ENERGIZED BY THE OUTPUT OF SAID PUSH-PULL AMPLIFIER STAGE SO AS TO BE ENERGIZED FOR CONSTANT SPEED ROTATION.
References Cited (Backward Citations)
US2257158A
Cited
US2794076A
Cited
US2832846A
Cited
US2814769A
Cited
US2864983A
Cited
US2786972A
Cited
US2995690A
Cited
US3083326A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-02-17 | 1967-08-19 | 1968-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-02-17 | 1971-08-19 | 1972-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-02-17 | 1975-08-19 | 1976-02-18 | $7700.00 | Window Closed / Lapsed |