US3103793A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Defrost controls for heat pumps
Assignee: Westinghouse Electric Corp
•
Filing: 1962-11-20
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Granted: 1963-09-17
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Expires: 1982-11-20
Abstract
No abstract record available.
Inventors
- 👤 William K Kyle
- 👤 Robert S Stewart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:56
CPC Classifications
F; F25; F25B; F25B13/00; F25B47/00; F25B47/02; F25B47/022; F25B47/025; F25B2313/00; F25B2313/025; F25B2400/00; F25B2400/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
212 words
AN AIR CONDITIONING SYSTEM COMPRISING A FIRST REFRIGERANT COMPRESSOR, A FIRST INDOOR COIL, A FIRST OUTDOOR COIL, MEANS INCLUDING A FIRST REVERSAL VALVE CONNECTING SAID COMPRESSOR TO SAID COILS, A FIRST SOLENOID FOR ADJUSTING SAID VALVE TO OPERATE SAID OUTDOOR COIL AS AN EVAPORATOR COIL OR AS A CONDENSER COIL, A SECOND REFRIGERANT COMPRESSOR, A SECOND INDOOR COIL, A SECOND OUTDOOR COIL, MEANS INCLUDING A SECOND REVERSAL VALVE FOR CONNECTING SAID SECOND COMPRESSOR TO SAID SECOND COILS, A SECOND SOLENOID FOR ADJUSTING SAID SECOND VALVE TO OPERATE AS AN EVAPORATOR COIL OR AS A CONDENSER COIL, A COMMON FAN FOR MOVING OUTDOOR AIR OVER SAID OUTDOOR COILS, AN ELECTRIC MOTOR FOR DRIVING SAID FAN, A DEFROST CONTROL RESPONSIVE TO AIR PRESSURE DROP ACROSS SAID OUTDOOR COILS, SAID CONTROL HAVING A NORMALLY OPEN SWITCH WHICH CLOSES WHEN THERE IS A PREDETERMINED PRESSURE DROP ACROSS SAID OUTDOOR COILS, A FIRST LIMIT CONTROL RESPONSIVE TO REFRIGERANT PRESSURE WITHIN SAID FIRST OUTDOOR COIL, SAID LIMIT CONTROL HAVING A NORMALLY CLOSED SWITCH WHICH OPENS WHEN THERE IS A PREDETERMINED PRESSURE WITHIN SAID FIRST OUTDOOR COIL, A SECOND LIMIT CONTROL RESPONSIVE TO REFRIGERANT PRESSURE WITHIN SAID SECOND OUTDOOR COIL, SAID SECOND LIMIT CONTROL HAVING A NORMALLY CLOSED SWITCH WHICH OPENS WHEN THERE IS A PREDETERMINED PRESSURE WITHIN SAID
Claim 2
Dependent Claim
212 words
AN AIR CONDITIONING SYSTEM COMPRISING A FIRST REFRIGERANT COMPRESSOR, A FIRST INDOOR COIL, A FIRST OUTDOOR COIL, MEANS INCLUDING A FIRST REVERSAL VALVE CONNECTING SAID COMPRESSOR TO SAID COILS, A FIRST SOLENOID FOR ADJUSTING SAID VALVE TO OPERATE SAID OUTDOOR COIL AS AN EVAPORATOR COIL OR AS A CONDENSER COIL, A SECOND REFRIGERANT COMPRESSOR, A SECOND INDOOR COIL, A SECOND OUTDOOR COIL, MEANS INCLUDING A SECOND REVERSAL VALVE FOR CONNECTING SAID SECOND COMPRESSOR TO SAID SECOND COILS, A SECOND SOLENOID FOR ADJUSTING SAID SECOND VALVE TO OPERATE AS AN EVAPORATOR COIL OR AS A CONDENSER COIL, A COMMON FAN FOR MOVING OUTDOOR AIR OVER SAID OUTDOOR COILS, AN ELECTRIC MOTOR FOR DRIVING SAID FAN, A DEFROST CONTROL RESPONSIVE TO AIR PRESSURE DROP ACROSS SAID OUTDOOR COILS, SAID CONTROL HAVING A NORMALLY OPEN SWITCH WHICH CLOSES WHEN THERE IS A PREDETERMINED PRESSURE DROP ACROSS SAID OUTDOOR COILS, A FIRST LIMIT CONTROL RESPONSIVE TO REFRIGERANT PRESSURE WITHIN SAID FIRST OUTDOOR COIL, SAID LIMIT CONTROL HAVING A NORMALLY CLOSED SWITCH WHICH OPENS WHEN THERE IS A PREDETERMINED PRESSURE WITHIN SAID FIRST OUTDOOR COIL, A SECOND LIMIT CONTROL RESPONSIVE TO REFRIGERANT PRESSURE WITHIN SAID SECOND OUTDOOR COIL, SAID SECOND LIMIT CONTROL HAVING A NORMALLY CLOSED SWITCH WHICH OPENS WHEN THERE IS A PREDETERMINED PRESSURE WITHIN SAID
References Cited (Backward Citations)
US2221688A
Cited
US3004399A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-09-16 | 1967-03-18 | 1967-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-09-16 | 1971-03-18 | 1971-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-09-16 | 1975-03-18 | 1975-09-17 | $7700.00 | Window Closed / Lapsed |