Patent US3814916A successfully refreshed from Google Patents.
Patent US3240028A successfully refreshed from Google Patents.
US3240028A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat pump defrosting system
Assignee: Individual
•
Filing: 1963-04-26
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Granted: 1966-03-15
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Expires: 1983-04-26
Abstract
No abstract record available.
Inventors
- 👤 Howard W Redfern
- 👤 Coleman William Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:43
CPC Classifications
F; F25; F25B; F25B13/00; F25B30/00; F25B30/02; F25B47/00; F25B47/02; F25B47/022; F25B47/025
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
A DEFROSTING APPARATUS FOR AN AIR-TO-AIR HEAT PUMP HAVING AN INDOOR COIL AND AN OUTDOOR COIL SELECTIVELY EMPLOYED AS A CONDENSER AND EVAPORATOR RESPECTIVELY, A COMPRESSOR AND A REVERSING VALVE TO SWITCH THE HEAT PUMP FROM A COOLING CYCLE TO A HEATING CYCLE, SAID DEFROSTING APPARATUS COMPRISING AN AUXILIARY HEATER FOR HOT GAS REFRIGERANT AND CONTROL MEANS FOR DIRECTING THE HOT GAS REFRIGERANT FROM THE COMPRESSOR INTO THE AUXILIARY HEATER AND THEN INTO THE OUTDOOR EVAPORATOR COIL DURING THE HEATING CYCLE INDEPENDENTLY OF THE INDOOR COIL ACTING AS A CONDENSER WHEN THE OUTDOOR COIL HAS BECOME FROSTED OR ICED THEREBY QUICKLY REMOVING THE ICE AND RESTORING THE EFFICIENCY OF THE OUTDOOR COIL WITHOUT SWITCHING THE INDOOR COIL FROM THE HEATING CYCLE.
Claim 2
Dependent Claim
121 words
A DEFROSTING APPARATUS FOR AN AIR-TO-AIR HEAT PUMP HAVING AN INDOOR COIL AND AN OUTDOOR COIL SELECTIVELY EMPLOYED AS A CONDENSER AND EVAPORATOR RESPECTIVELY, A COMPRESSOR AND A REVERSING VALVE TO SWITCH THE HEAT PUMP FROM A COOLING CYCLE TO A HEATING CYCLE, SAID DEFROSTING APPARATUS COMPRISING AN AUXILIARY HEATER FOR HOT GAS REFRIGERANT AND CONTROL MEANS FOR DIRECTING THE HOT GAS REFRIGERANT FROM THE COMPRESSOR INTO THE AUXILIARY HEATER AND THEN INTO THE OUTDOOR EVAPORATOR COIL DURING THE HEATING CYCLE INDEPENDENTLY OF THE INDOOR COIL ACTING AS A CONDENSER WHEN THE OUTDOOR COIL HAS BECOME FROSTED OR ICED THEREBY QUICKLY REMOVING THE ICE AND RESTORING THE EFFICIENCY OF THE OUTDOOR COIL WITHOUT SWITCHING THE INDOOR COIL FROM THE HEATING CYCLE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-03-14 | 1969-09-13 | 1970-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-14 | 1973-09-13 | 1974-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-14 | 1977-09-13 | 1978-03-15 | $7700.00 | Window Closed / Lapsed |