US3321669A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Time delay circuit using thermistors
Assignee: YORK-LUXAIRE Inc A CORP OF DE
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Filing: 1964-04-13
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Granted: 1967-05-23
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Expires: 1984-04-13
Abstract
No abstract record available.
Inventors
- 👤 Alan L Rhodes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:17
CPC Classifications
H; H02; H02H; H02H5/00; H02H5/08; H02H5/086; F; F25; F25B; F25B31/00; F25B31/002; F25B49/00; F25B49/02; H01; H01C; H01C7/00; H01C7/02; H01C7/022
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
A PROTECTIVE CIRCUIT FOR A REFRIGERANT COMPRESSOR HAVING AN ELECTRIC DRIVING MOTOR, COMPRISING AN OIL PRESSURESTAT CONNECTED TO SAID COMPRESSOR, A SWITCH CLOSED BY SAID PRESSURESTAT WHEN THE PRESSURE WITHIN SAID PRESSURESTAT IS BELOW NORMAL, A PROTECTIVE RELAY HAVING A SWITCH WHICH IS CLOSED WHEN SAID RELAY IS ENERGIZED, A STARTER RELAY FOR SAID MOTOR, SAID STARTER RELAY HAVING A SWITCH WHICH IS CLOSED WHEN SAID STARTER RELAY IS ENERGIZED, ELECTRIC SUPPLY CONNECTIONS, MEANS CONNECTING SAID SWITCH OF SAID PROTECTIVE RELAY AND SAID STARTER RELAY IN SERIES TO SAID CONNECTIONS, MEANS CONNECTING SAID SWITCH OF SAID STARTER RELAY AND SAID MOTOR IN SERIES TO SAID CONNECTIONS, A THERMISTOR HAVING A POSITIVE TEMPERATURE COEFFICIENT OF RESISTANCE, MEANS CONNECTING SAID THERMISTOR AND SAID PROTECTIVE RELAY IN SERIES TO SAID CONNECTIONS, A HEATER RESISTOR ADJACENT TO SAID THERMISTOR FOR HEATING SAID THERMISTOR WHEN SAID RE-
Claim 2
Dependent Claim
142 words
A PROTECTIVE CIRCUIT FOR A REFRIGERANT COMPRESSOR HAVING AN ELECTRIC DRIVING MOTOR, COMPRISING AN OIL PRESSURESTAT CONNECTED TO SAID COMPRESSOR, A SWITCH CLOSED BY SAID PRESSURESTAT WHEN THE PRESSURE WITHIN SAID PRESSURESTAT IS BELOW NORMAL, A PROTECTIVE RELAY HAVING A SWITCH WHICH IS CLOSED WHEN SAID RELAY IS ENERGIZED, A STARTER RELAY FOR SAID MOTOR, SAID STARTER RELAY HAVING A SWITCH WHICH IS CLOSED WHEN SAID STARTER RELAY IS ENERGIZED, ELECTRIC SUPPLY CONNECTIONS, MEANS CONNECTING SAID SWITCH OF SAID PROTECTIVE RELAY AND SAID STARTER RELAY IN SERIES TO SAID CONNECTIONS, MEANS CONNECTING SAID SWITCH OF SAID STARTER RELAY AND SAID MOTOR IN SERIES TO SAID CONNECTIONS, A THERMISTOR HAVING A POSITIVE TEMPERATURE COEFFICIENT OF RESISTANCE, MEANS CONNECTING SAID THERMISTOR AND SAID PROTECTIVE RELAY IN SERIES TO SAID CONNECTIONS, A HEATER RESISTOR ADJACENT TO SAID THERMISTOR FOR HEATING SAID THERMISTOR WHEN SAID RE-
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-05-22 | 1970-11-21 | 1971-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-05-22 | 1974-11-21 | 1975-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-05-22 | 1978-11-21 | 1979-05-23 | $7700.00 | Window Closed / Lapsed |