Patent US1769726A successfully refreshed from Google Patents.
Patent US3202898A successfully refreshed from Google Patents.
US3202898A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit for regulating the speed of d. c. motors
Assignee: Individual
•
Filing: 1957-10-15
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Granted: 1965-08-24
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Expires: 1977-10-15
Abstract
No abstract record available.
Inventors
- 👤 Genning Ernst
- 👤 Hohler Albert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:35
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/063; Y; Y10; Y10S; Y10S388/00; Y10S388/90; Y10S388/903; Y10S388/923; Y10S388/924; Y10S388/926
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
A CONSTANT-SPEED ELECTRIC MOTOR SYSTEM COMPRISING AN ELECTRIC MOTOR HAVING A ROTATABLE SHAFT, A GOVENOR SWITCH MOUNTED ON SAID SHAFT, SAID SWITCH BEING NORMALLY CLOSED AND BEING CAUSED TO OPEN WHEN THE MOTOR SPEED EXCEEDS A GIVEN VALUE, A VOLTAGE SOURCE FOR ENERGIZING SAID MOTOR, A CONTROL CIRCUIT FOR CONNECTING SAID MOTOR TO SAID SOURCE, SAID CONTROL CIRCUIT INCLUDING A TRANSISTOR HAVING BASE, COLLECTOR AND EMITTER ELECTRODES, SAID SOURCE BEING CONNECTED IN SERIES WITH SAID EMITTER AND COLLECTOR ELECTRODES TO SAID MOTOR, AND MEANS INCLUDING SAID CLOSED GOVENOR SWITCH TO APPLY A BIAS TO SAID TRANSISTOR RENDERING SAME CONDUCTIVE TO PROVIDE A CURRENT PATH FOR SAID MOTOR, SAID TRANSISTOR BEING RENDERED NON-CONDUUCTIVE WHEN SAID SWITCH IS OPEN.
Claim 2
Dependent Claim
117 words
A CONSTANT-SPEED ELECTRIC MOTOR SYSTEM COMPRISING AN ELECTRIC MOTOR HAVING A ROTATABLE SHAFT, A GOVENOR SWITCH MOUNTED ON SAID SHAFT, SAID SWITCH BEING NORMALLY CLOSED AND BEING CAUSED TO OPEN WHEN THE MOTOR SPEED EXCEEDS A GIVEN VALUE, A VOLTAGE SOURCE FOR ENERGIZING SAID MOTOR, A CONTROL CIRCUIT FOR CONNECTING SAID MOTOR TO SAID SOURCE, SAID CONTROL CIRCUIT INCLUDING A TRANSISTOR HAVING BASE, COLLECTOR AND EMITTER ELECTRODES, SAID SOURCE BEING CONNECTED IN SERIES WITH SAID EMITTER AND COLLECTOR ELECTRODES TO SAID MOTOR, AND MEANS INCLUDING SAID CLOSED GOVENOR SWITCH TO APPLY A BIAS TO SAID TRANSISTOR RENDERING SAME CONDUCTIVE TO PROVIDE A CURRENT PATH FOR SAID MOTOR, SAID TRANSISTOR BEING RENDERED NON-CONDUUCTIVE WHEN SAID SWITCH IS OPEN.
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) | 1968-08-23 | 1969-02-22 | 1969-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-23 | 1973-02-22 | 1973-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-23 | 1977-02-22 | 1977-08-24 | $7700.00 | Window Closed / Lapsed |