US3293880A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reversing valve for refrigeration systems and air conditioning systems
Assignee: Individual
•
Filing: 1965-09-16
•
Granted: 1966-12-27
•
Expires: 1985-09-16
Abstract
No abstract record available.
Inventors
- 👤 Fred A Greenawalt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 00:40
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/12; F16K31/42; F16K31/423; F16K31/426; F25; F25B; F25B41/00; F25B41/20; F25B41/26; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86718; Y10T137/86726
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
152 words
IN A REVERSIBLE CYCLE REFRIGERANT SYSTEM HAVING A COMPRESSOR, AND A PAIR OF HEAT EXCHANGERS CONNECTED IN A CIRCUIT, A REVERSING VALVE FOR SELECTIVELY REVERSING THE ORDER OF FLOW OF REFRIGERANT THROUGH SAID HEAT EXCHANGERS, SAID VALVE COMPRISING A HOLLOW VALVE BODY HAVING A FIRST PORT INTERMEDIATE THE ENDS THEREOF CONNECTED TO THE INTAKE OF SAID COMPRESSOR, SAID VALVE BODY HAVING A PAIR OF PORTS ON OPPOSITE SIDES OF SAID FIRST PORT CONNECTED TO SAID PAIR OF HEAT EXHANGERS, SAID VALVE BODY HAVING A PAIR OF INLET OPENINGS SPACED LONGITUDINALLY THEREOF ON OPPOSITE SIDES OF SAID PORTS, MEANS FOR SELECTIVELY CONNECTING THE DISCHARGE SIDE OF SAID COMPRESSOR TO ONE OR THE OTHER OF SAID INLET OPENINGS, A PISTON MOUNTED FOR FREE SLIDING MOVEMENT IN SAID VALVE BODY BETWEEN A PAIR OF LIMIT POSITONS SAID PISTON COOPERATING WITH SAID VALVE BODY TO FORM A CHAMBER INTERMEDIATE THE ENDS OF SAID PISTON SHAPED SO
Claim 2
Dependent Claim
152 words
IN A REVERSIBLE CYCLE REFRIGERANT SYSTEM HAVING A COMPRESSOR, AND A PAIR OF HEAT EXCHANGERS CONNECTED IN A CIRCUIT, A REVERSING VALVE FOR SELECTIVELY REVERSING THE ORDER OF FLOW OF REFRIGERANT THROUGH SAID HEAT EXCHANGERS, SAID VALVE COMPRISING A HOLLOW VALVE BODY HAVING A FIRST PORT INTERMEDIATE THE ENDS THEREOF CONNECTED TO THE INTAKE OF SAID COMPRESSOR, SAID VALVE BODY HAVING A PAIR OF PORTS ON OPPOSITE SIDES OF SAID FIRST PORT CONNECTED TO SAID PAIR OF HEAT EXHANGERS, SAID VALVE BODY HAVING A PAIR OF INLET OPENINGS SPACED LONGITUDINALLY THEREOF ON OPPOSITE SIDES OF SAID PORTS, MEANS FOR SELECTIVELY CONNECTING THE DISCHARGE SIDE OF SAID COMPRESSOR TO ONE OR THE OTHER OF SAID INLET OPENINGS, A PISTON MOUNTED FOR FREE SLIDING MOVEMENT IN SAID VALVE BODY BETWEEN A PAIR OF LIMIT POSITONS SAID PISTON COOPERATING WITH SAID VALVE BODY TO FORM A CHAMBER INTERMEDIATE THE ENDS OF SAID PISTON SHAPED SO
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) | 1969-12-26 | 1970-06-27 | 1970-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-26 | 1974-06-27 | 1974-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-26 | 1978-06-27 | 1978-12-27 | $7700.00 | Window Closed / Lapsed |