US3274793A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat pump defrost system
Assignee: YORK-LUXAIRE Inc A CORP OF DE
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Filing: 1965-04-05
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Granted: 1966-09-27
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Expires: 1985-04-05
Abstract
No abstract record available.
Inventors
- 👤 Richard M Anderson
- 👤 Robert A Essig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:02
CPC Classifications
F; F25; F25B; F25B13/00; F25B47/00; F25B47/02; F25B47/022; F25B47/025
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
184 words
A HEAT PUMP SYSTEM COMPRISING, AN INDOOR HEAT EXCHANGER, AN OUTDOOR HEAT EXCHANGER, MEANS FOR RESTRICTING THE FLOW OF REFRIGERANT BETWEEN SAID EXCHANGERS, AND A DIFFERENTIAL PRESSURE RESPONSIVE BYPASS CHECK VALVE CONNECTED IN PARALLEL WITH SAID RESTRICTION MEANS AND HAVING MEANS ADAPTED TO HAVE AN OPEN POSITION TOGETHER WITH A PARTLY CLOSED POSITION AND A FULLY CLOSED POSITION TO BE RESPONSIVE TO THE FLOW OF REFRIGERANT BETWEEN SAID EXCHANGERS IN A DIRECTION TO COOL SAID OUTDOOR HEAT EXCHANGER TO MOVE SAID CHECK VALVE TO THE OPEN POSITION AND RESPONSIVE TO THE FLOW OF REFRIGERANT UNDER RELATIVELY LOW PRESSURE BETWEEN SAID EXCHANGER IN A DIRECTION TO HEAT SAID OUTDOOR EXCHANGER TO MOVE SAID CHECK VALVE TO THE PARTLY CLOSED POSITION THEREBY PARTIALLY BYPASSING SAID RESTRICTION TO ACCELERATE THE LOADING AND HEATING OF SAID OUTDOOR HEAT EXCHANGER FOR DEFROSTING PURPOSES AND TO BE RESPONSIVE TO THE FLOW OF REFRIGERANT UNDER RELATIVELY HIGH PRESSURE BETWEEN SAID EXCHANGERS IN THE DIRECTION TO HEAT SAID OUTDOOR HEAT EXCHANGER TO THEREBY MOVE SAID CHECK VALVE TO THE FULLY CLOSED POSITION FOR CONTINUED OPERATION AND HEATING OF SAID OUTDOOR HEAT EXCHANGER.
Claim 2
Dependent Claim
184 words
A HEAT PUMP SYSTEM COMPRISING, AN INDOOR HEAT EXCHANGER, AN OUTDOOR HEAT EXCHANGER, MEANS FOR RESTRICTING THE FLOW OF REFRIGERANT BETWEEN SAID EXCHANGERS, AND A DIFFERENTIAL PRESSURE RESPONSIVE BYPASS CHECK VALVE CONNECTED IN PARALLEL WITH SAID RESTRICTION MEANS AND HAVING MEANS ADAPTED TO HAVE AN OPEN POSITION TOGETHER WITH A PARTLY CLOSED POSITION AND A FULLY CLOSED POSITION TO BE RESPONSIVE TO THE FLOW OF REFRIGERANT BETWEEN SAID EXCHANGERS IN A DIRECTION TO COOL SAID OUTDOOR HEAT EXCHANGER TO MOVE SAID CHECK VALVE TO THE OPEN POSITION AND RESPONSIVE TO THE FLOW OF REFRIGERANT UNDER RELATIVELY LOW PRESSURE BETWEEN SAID EXCHANGER IN A DIRECTION TO HEAT SAID OUTDOOR EXCHANGER TO MOVE SAID CHECK VALVE TO THE PARTLY CLOSED POSITION THEREBY PARTIALLY BYPASSING SAID RESTRICTION TO ACCELERATE THE LOADING AND HEATING OF SAID OUTDOOR HEAT EXCHANGER FOR DEFROSTING PURPOSES AND TO BE RESPONSIVE TO THE FLOW OF REFRIGERANT UNDER RELATIVELY HIGH PRESSURE BETWEEN SAID EXCHANGERS IN THE DIRECTION TO HEAT SAID OUTDOOR HEAT EXCHANGER TO THEREBY MOVE SAID CHECK VALVE TO THE FULLY CLOSED POSITION FOR CONTINUED OPERATION AND HEATING OF SAID OUTDOOR HEAT EXCHANGER.
References Cited (Backward Citations)
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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) | 1969-09-26 | 1970-03-28 | 1970-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-26 | 1974-03-28 | 1974-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-26 | 1978-03-28 | 1978-09-27 | $7700.00 | Window Closed / Lapsed |