US3213637A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refrigeration defrost system
Assignee: Recold Corp
•
Filing: 1963-10-28
•
Granted: 1965-10-26
•
Expires: 1983-10-28
Abstract
No abstract record available.
Inventors
- 👤 Harold A Halls
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:19
CPC Classifications
F; F25; F25B; F25B47/00; F25B47/02; F25B47/022
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
149 words
IN A REFRIGERATION SYSTEM OF THE CHARACTER DESCRIBED, SAID SYSTEM INCLUDING A HIGH PRESSURE SYSTEM COMPRISING A COMPRESSOR, A HIGH PRESSURE LINE, A CONDENSER, A RECEIVER, A RECEIVER OUTLET LINE, AN EXPANSION VALVE, A LOW PRESSURE SYSTEM COMPRISING AN EVAPORATOR, A LOW PRESSURE LINE, A REFRIGERANT FLOW CONTROL MEANS AND A LOW PRESSURE LINE RETURNING TO SAID COMPRESSOR, IN COMBINATION WITH SAID REFRIGERATION SYSTEM; MEANS FOR REVERSING THE FLOW OF REFRIGERANT IN SAID SYSTEM DURING THE DEFROST CYCLE COMPRISING A SERIES OF CONTROL VALVES INTERPOSED IN SAID HIGH AND LOW PRESSURE LINES, CHECK VALVE MEANS FOR CONTROLLING THE DIRECTION OF THE PASSAGE OF LIQUID OR GASEOUS REFRIGERANT IN SAID REFRIFERATION SYSTEM, SAID VALVES OPERATING DURING THE DEFROST CYCLE TO PASS GASEOUS REFRIGERANT TO SAID EVAPORATOR, A FLOW CONTROL MEANS NORMALLY POSITIONED IN THE LOW PRESSURE SIDE OF THE SYSTEM AND OPERABLE DURING DEFROSTING TO SEPARATE LIQUID FROM GASEOUS REFRIGERANT
Claim 2
Dependent Claim
149 words
IN A REFRIGERATION SYSTEM OF THE CHARACTER DESCRIBED, SAID SYSTEM INCLUDING A HIGH PRESSURE SYSTEM COMPRISING A COMPRESSOR, A HIGH PRESSURE LINE, A CONDENSER, A RECEIVER, A RECEIVER OUTLET LINE, AN EXPANSION VALVE, A LOW PRESSURE SYSTEM COMPRISING AN EVAPORATOR, A LOW PRESSURE LINE, A REFRIGERANT FLOW CONTROL MEANS AND A LOW PRESSURE LINE RETURNING TO SAID COMPRESSOR, IN COMBINATION WITH SAID REFRIGERATION SYSTEM; MEANS FOR REVERSING THE FLOW OF REFRIGERANT IN SAID SYSTEM DURING THE DEFROST CYCLE COMPRISING A SERIES OF CONTROL VALVES INTERPOSED IN SAID HIGH AND LOW PRESSURE LINES, CHECK VALVE MEANS FOR CONTROLLING THE DIRECTION OF THE PASSAGE OF LIQUID OR GASEOUS REFRIGERANT IN SAID REFRIFERATION SYSTEM, SAID VALVES OPERATING DURING THE DEFROST CYCLE TO PASS GASEOUS REFRIGERANT TO SAID EVAPORATOR, A FLOW CONTROL MEANS NORMALLY POSITIONED IN THE LOW PRESSURE SIDE OF THE SYSTEM AND OPERABLE DURING DEFROSTING TO SEPARATE LIQUID FROM GASEOUS REFRIGERANT
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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) | 1968-10-25 | 1969-04-26 | 1969-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-25 | 1973-04-26 | 1973-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-25 | 1977-04-26 | 1977-10-26 | $7700.00 | Window Closed / Lapsed |