Patent US5522899A successfully refreshed from Google Patents.
US3202899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motor control system
Assignee: Motors Liquidation Co
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Filing: 1961-12-21
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Granted: 1965-08-24
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Expires: 1981-12-21
Abstract
No abstract record available.
Inventors
- 👤 Charles C Gambill
- 👤 Alfred B Roby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:20
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/292; H02P7/293; Y; Y10; Y10S; Y10S388/00; Y10S388/907; Y10S388/917; Y10S388/919
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
199 words
IN A MOTOR SPEED CONTROL CIRCUIT, A SOURCE OF ALTERNATING CURRENT POWER, A MOTOR, MEANS CONNECTING SAID MOTOR TO SAID POWER SOURCE INCLUDING A SILICON CONTROLLED RECTIFIER HAVINGG A GATE, A FITST PAIR OF DIODES CONNECTED IN SERIES WITH SAID RECTIFIER AND ARRANGED TO CONDUCT CURRENT THROUGH SAID RECTIFIER IN ONE DIRECTION DURING ONE PORTION OF EACH CYCLE, A SECOND PAIR OF DIODES CONNECTED IN SERIES WITHH SAID RECTIFIER AND ARRANGED TO CONDUCT CURRENT THROUGH SAID RECTIFIER IN SAID ONE DIRECTION DURING ANOTHER PORTION OFF SAID CYCLE, SAID SILICON CONTROLLED RECTIFIER HAVING AN INPUT TERMIINAL AND AN OUTPUT TERMINAL, A SHUNT CIRCUIT CONTAINING A CAPACITOR AND A RESISTANCE CONNECTING THE INPUT TERMINAL AND THE OUTPUT TERMINAL OF SAID RECTIFIER, AND A FOUR-LAYER DIODE CONNECTING THE GATE OF SAID RECTIFIER WITH A POINT ON SAID SHUNT CIRCUIT BETWEN SAID CAPACITOR AND SAID RESISTANCE WHEREBY SAID RESISTANCCE CAPACITOR SHUNT CCIRCUIT IS SUPPLIED WITH RECTIFIED CURRENT TO BUILD UP A CHARGE UPON SAID CAPACITOR IN ACCORDANCE WITH THE TIME CONSTANT OF SAID SHUNT SUFFICIENT PERIODICALLY TO BREAK DOWN SAID FOUR-LAYER DIODE AND ALLOW SAID CAPACITOR TO DISCHARGE PERIODICALLY THROUGH SAID FOUR-LAYER DIODDE TO SAID GATE TO PERIODICALLY FIRE SAID SILICON CONTROLLED RECTIFFIER.
Claim 2
Dependent Claim
199 words
IN A MOTOR SPEED CONTROL CIRCUIT, A SOURCE OF ALTERNATING CURRENT POWER, A MOTOR, MEANS CONNECTING SAID MOTOR TO SAID POWER SOURCE INCLUDING A SILICON CONTROLLED RECTIFIER HAVINGG A GATE, A FITST PAIR OF DIODES CONNECTED IN SERIES WITH SAID RECTIFIER AND ARRANGED TO CONDUCT CURRENT THROUGH SAID RECTIFIER IN ONE DIRECTION DURING ONE PORTION OF EACH CYCLE, A SECOND PAIR OF DIODES CONNECTED IN SERIES WITHH SAID RECTIFIER AND ARRANGED TO CONDUCT CURRENT THROUGH SAID RECTIFIER IN SAID ONE DIRECTION DURING ANOTHER PORTION OFF SAID CYCLE, SAID SILICON CONTROLLED RECTIFIER HAVING AN INPUT TERMIINAL AND AN OUTPUT TERMINAL, A SHUNT CIRCUIT CONTAINING A CAPACITOR AND A RESISTANCE CONNECTING THE INPUT TERMINAL AND THE OUTPUT TERMINAL OF SAID RECTIFIER, AND A FOUR-LAYER DIODE CONNECTING THE GATE OF SAID RECTIFIER WITH A POINT ON SAID SHUNT CIRCUIT BETWEN SAID CAPACITOR AND SAID RESISTANCE WHEREBY SAID RESISTANCCE CAPACITOR SHUNT CCIRCUIT IS SUPPLIED WITH RECTIFIED CURRENT TO BUILD UP A CHARGE UPON SAID CAPACITOR IN ACCORDANCE WITH THE TIME CONSTANT OF SAID SHUNT SUFFICIENT PERIODICALLY TO BREAK DOWN SAID FOUR-LAYER DIODE AND ALLOW SAID CAPACITOR TO DISCHARGE PERIODICALLY THROUGH SAID FOUR-LAYER DIODDE TO SAID GATE TO PERIODICALLY FIRE SAID SILICON CONTROLLED RECTIFFIER.
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) | 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 |