Patent US3071718A successfully refreshed from Google Patents.
US3071718A
Expired / Lapsed
US
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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
- 👤 James F Gordon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:16
CPC Classifications
H; H02; H02H; H02H5/00; H02H5/04; H02H5/042
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
A MOTOR PROTECTION CIRCUIT FOR INTERRUPTING THE SUPPLY OF POWER TO A MOTOR UPON AN ABNORMAL INCREASE IN THE TEMPERATURE THEREOF, SAID CIRCUIT COMPRISING A PAIR OF SUPPLY LINES FOR CONNECTING SAID MOTOR TO A POWER SOURCE, A PAIR OF SILICON CONTROLLED RECTIFIERS EACH HAVING A CONTROL GATE ELEMENT, SAID RECTIFIERS BEING CONNECTED IN PARALLEL AND REVERSED RELATIONSHIP WITH ONE ANOTHER IN ONE OF SAID SUPPLY LINES, SIGNAL SUPPLY MEANS FOR NORMALLY SUPPLYING TO SAID GATE ELEMENTS A GATING CONTROL SIGNAL SUFFICIENT TO FIRE SAID RECTIFIERS WHEN SAID POWER LINES ARE CONNECTED TO A POWER SOURCE, AND MEANS RESPONSIVE TO AN ABNORMAL INCREASE IN THE TEMPERATURE OF SAID MOTOR FOR SHORTING SAID SIGNAL SUPPLY MEANS TO DECREASE SAID CONTROL SIGNAL TO A VALUE BELOW THAT REQUIRED TO FIRE SAID RECTIFIERS.
Claim 2
Dependent Claim
130 words
A MOTOR PROTECTION CIRCUIT FOR INTERRUPTING THE SUPPLY OF POWER TO A MOTOR UPON AN ABNORMAL INCREASE IN THE TEMPERATURE THEREOF, SAID CIRCUIT COMPRISING A PAIR OF SUPPLY LINES FOR CONNECTING SAID MOTOR TO A POWER SOURCE, A PAIR OF SILICON CONTROLLED RECTIFIERS EACH HAVING A CONTROL GATE ELEMENT, SAID RECTIFIERS BEING CONNECTED IN PARALLEL AND REVERSED RELATIONSHIP WITH ONE ANOTHER IN ONE OF SAID SUPPLY LINES, SIGNAL SUPPLY MEANS FOR NORMALLY SUPPLYING TO SAID GATE ELEMENTS A GATING CONTROL SIGNAL SUFFICIENT TO FIRE SAID RECTIFIERS WHEN SAID POWER LINES ARE CONNECTED TO A POWER SOURCE, AND MEANS RESPONSIVE TO AN ABNORMAL INCREASE IN THE TEMPERATURE OF SAID MOTOR FOR SHORTING SAID SIGNAL SUPPLY MEANS TO DECREASE SAID CONTROL SIGNAL TO A VALUE BELOW THAT REQUIRED TO FIRE SAID RECTIFIERS.
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 |