Patent US1676561A successfully refreshed from Google Patents.
Patent US3681934A successfully refreshed from Google Patents.
US3681934A
Expired / Lapsed
US
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Refrigeration and defrost system
Assignee: Bangor Punta Operations Inc
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Filing: 1970-09-11
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Granted: 1972-08-08
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Expires: 1990-09-11
Abstract
Abstract The system includes a closed cycle, series connected compressor, condenser, expansion valve and evaporator with refrigerant flowing through the system in one direction for the refrigerating cycle. For defrosting, a conduit is provided for delivery of subcooled refrigerant from the outlet of the condenser to the outlet of the evaporator, a pump being provided to pump refrigerant in the opposite direction through the evaporator to effect defrosting thereof.
Inventors
- 👤 Arthur F Tudury
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:17
CPC Classifications
F; F25; F25B; F25B5/00; F25B5/02; F25B47/00; F25B47/02; F25B47/022; F25B2400/00; F25B2400/16
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
106 words
A refrigeration and defrosting system comprising a compressor, a condenser, receiver, a thermal expansion valve, and an evaporator, conduit means connecting said compressor, condenser, receiver, valve and evaporator in series to define a first circuit for normally flowing a refrigerant therethrough in a direction to provide a refrigeration cycle, a pump having an inlet and an outlet and conduit means connecting said receiver to said pump inlet, said pump outlet to said evaporator, and said evaporator to said receiver to define a second circuit for the flow of subcooled liquid refrigerant from said receiver to said evaporator and return to said receiver for defrosting the evaporator.
Claim 2
Dependent Claim
106 words
A refrigeration and defrosting system comprising a compressor, a condenser, receiver, a thermal expansion valve, and an evaporator, conduit means connecting said compressor, condenser, receiver, valve and evaporator in series to define a first circuit for normally flowing a refrigerant therethrough in a direction to provide a refrigeration cycle, a pump having an inlet and an outlet and conduit means connecting said receiver to said pump inlet, said pump outlet to said evaporator, and said evaporator to said receiver to define a second circuit for the flow of subcooled liquid refrigerant from said receiver to said evaporator and return to said receiver for defrosting the evaporator.
Claim 3
Dependent Claim
26 words
The system according to claim 1 including a conduit bypassing said expansion valve for returning refrigerant from said evaporator to said receiver during the defrosting cycle.
Claim 4
Dependent Claim
21 words
The system according to claim 2 including means for preventing flow of refrigerant in the refrigerating cycle trough said bypass conduit.
Claim 5
Dependent Claim
39 words
The system according to claim 1 including a heater disposed in said connecting means defining said second circuit between said condenser and said evaporator for supplying additional heat to the subcooled refrigerant prior to its flow through said evaporator.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |