US3071719A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motor protection circuit
Assignee: General Electric Co
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Filing: 1961-04-28
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Granted: 1963-01-01
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Expires: 1981-04-28
Abstract
No abstract record available.
Inventors
- 👤 Bruce B Latter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:40
CPC Classifications
H; H02; H02H; H02H7/00; H02H7/08; H02H7/085; H02P; H02P1/00; H02P1/16; H02P1/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
151 words
IN COMBINATION, AN ELECTRIC MOTOR HAVING A ROTOR AND A RUN WINDING, A THERMAL OVERLOAD PROTECTOR SWITCH INCLUDING NORMALLY CLOSED CONTACTS AND A RESISTANCE HEATER FOR HEATING SAID SWITCH, CONNECTING MEANS FOR CONNECTING SAID SWITCH CONTACTS, SAID RESISTANCE HEATER AND SAID WINDING IN SERIES CONNECTION TO A POWER SUPPLY LINE WHEREBY SAID SWITCH IS HEATED BY THE CURRENT FLOWING TO SAID WINDING, AND MEANS FOR DECREASING THE HEATING EFFECT OF SAID CURRENT WHEN SAID ROTOR IS ROTATING COMPRISING A SILICON CONTROLLED RECTIFIER CONNECTED ACROSS SAID RESISTANCE HEATER AND AN AUXILIARY WINDING IN SAID MOTOR AND ADAPTED TO HAVE A VOLTAGE INDUCED THEREIN BY ROTATION OF SAID ROTOR, SAID RECTIFIER INCLUDING A GATE ELEMENT, SAID ELEMENT BEING CONNECTED TO SAID AUXILIARY WINDING WHEREBY THE VOLTAGE INDUCED IN SAID AUXILIARY WINDING DURING ROTATION OF SAID ROTOR FIRES SAID RECTIFIER TO PROVIDE A PARTIAL SHUNT AROUND SAID RESISTANCE HEATER WHEN SAID MOTOR IS RUNNING.
Claim 2
Dependent Claim
151 words
IN COMBINATION, AN ELECTRIC MOTOR HAVING A ROTOR AND A RUN WINDING, A THERMAL OVERLOAD PROTECTOR SWITCH INCLUDING NORMALLY CLOSED CONTACTS AND A RESISTANCE HEATER FOR HEATING SAID SWITCH, CONNECTING MEANS FOR CONNECTING SAID SWITCH CONTACTS, SAID RESISTANCE HEATER AND SAID WINDING IN SERIES CONNECTION TO A POWER SUPPLY LINE WHEREBY SAID SWITCH IS HEATED BY THE CURRENT FLOWING TO SAID WINDING, AND MEANS FOR DECREASING THE HEATING EFFECT OF SAID CURRENT WHEN SAID ROTOR IS ROTATING COMPRISING A SILICON CONTROLLED RECTIFIER CONNECTED ACROSS SAID RESISTANCE HEATER AND AN AUXILIARY WINDING IN SAID MOTOR AND ADAPTED TO HAVE A VOLTAGE INDUCED THEREIN BY ROTATION OF SAID ROTOR, SAID RECTIFIER INCLUDING A GATE ELEMENT, SAID ELEMENT BEING CONNECTED TO SAID AUXILIARY WINDING WHEREBY THE VOLTAGE INDUCED IN SAID AUXILIARY WINDING DURING ROTATION OF SAID ROTOR FIRES SAID RECTIFIER TO PROVIDE A PARTIAL SHUNT AROUND SAID RESISTANCE HEATER WHEN SAID MOTOR IS RUNNING.
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) | 1965-12-31 | 1966-07-02 | 1967-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-12-31 | 1970-07-02 | 1971-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-12-31 | 1974-07-02 | 1975-01-01 | $7700.00 | Window Closed / Lapsed |