US3141996A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal protector
Assignee: Carrier Corp
•
Filing: 1959-01-02
•
Granted: 1964-07-21
•
Expires: 1979-01-02
Abstract
No abstract record available.
Inventors
- 👤 William L Mcgrath
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:47
CPC Classifications
H; H02; H02H; H02H5/00; H02H5/04; H02H5/047; H02H5/048; H02K; H02K11/00; H02K11/20; H02K11/25
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
131 words
A THERMAL PROTECTIVE CIRCUIT FOR A POLYPHASE MOTOR COMPRISING THE COMBINATION OF CONTROL MEANS FOR OPENING AND CLOSING THE CIRCUIT; A THERMAL PROTECTIVE DEVICE PLACED IN AT LEAST EACH OF TWO CONDUCTORS OF SAID CIRCUIT; EACH OF SAID DEVICES INCLUDING A SNAP-ACTING THERMOSTAT, SAID THERMOSTAT BEING HEATED BY THE PASSING OF AN EXCESSIVE AMOUNT OF CURRENT THROUGH THE LINE IN WHICH IT IS LOCATED AND A HEATING MEANS IN EACH OF SAID DEVICES POSITIONED PROXIMATE EACH OF SAID THERMOSTATS; AND CIRCUIT MEANS FOR CAUSING EACH OF SAID THERMOSTATS TO SHUNT THE HEATING MEANS OF THE OTHER DEVICE WHEREBY THE PASSING OF EXCESSIVE CURRENT THROUGH A LINE WILL CAUSE SAID THERMOSTAT TO OPEN TO IN TURN CAUSE SAID HEATING MEANS SHUNTED THEREBY TO HEAT AND THUS OPEN THE OTHER OF SAID THERMOSTATS.
Claim 2
Dependent Claim
131 words
A THERMAL PROTECTIVE CIRCUIT FOR A POLYPHASE MOTOR COMPRISING THE COMBINATION OF CONTROL MEANS FOR OPENING AND CLOSING THE CIRCUIT; A THERMAL PROTECTIVE DEVICE PLACED IN AT LEAST EACH OF TWO CONDUCTORS OF SAID CIRCUIT; EACH OF SAID DEVICES INCLUDING A SNAP-ACTING THERMOSTAT, SAID THERMOSTAT BEING HEATED BY THE PASSING OF AN EXCESSIVE AMOUNT OF CURRENT THROUGH THE LINE IN WHICH IT IS LOCATED AND A HEATING MEANS IN EACH OF SAID DEVICES POSITIONED PROXIMATE EACH OF SAID THERMOSTATS; AND CIRCUIT MEANS FOR CAUSING EACH OF SAID THERMOSTATS TO SHUNT THE HEATING MEANS OF THE OTHER DEVICE WHEREBY THE PASSING OF EXCESSIVE CURRENT THROUGH A LINE WILL CAUSE SAID THERMOSTAT TO OPEN TO IN TURN CAUSE SAID HEATING MEANS SHUNTED THEREBY TO HEAT AND THUS OPEN THE OTHER OF SAID THERMOSTATS.
References Cited (Backward Citations)
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Cited
US1701757A
Cited
US1798366A
Cited
US1830578A
Cited
US1997673A
Cited
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Cited
US2324161A
Cited
US2967977A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-07-21 | 1968-01-20 | 1968-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-21 | 1972-01-20 | 1972-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-21 | 1976-01-20 | 1976-07-21 | $7700.00 | Window Closed / Lapsed |