US3078683A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refrigerator
Assignee: US Philips Corp
•
Filing: 1961-05-15
•
Granted: 1963-02-26
•
Expires: 1981-05-15
Abstract
No abstract record available.
Inventors
- 👤 Dros Albert August
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:34
CPC Classifications
F; F25; F25B; F25B9/00; F25B9/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
152 words
A REFRIGERATOR COMPRISING A FIRST CYLINDER HAVING A COMPRESSION PISTON RECIPROCATING THEREIN AND A SECOND CYLINDER WITH AN EXPANSION PISTON RECIPROCATING THEREIN AND PART OF SAID SECOND CYLINDER BEING AN EXPANSION CHAMBER HAVING A REGERERATOR THEREIN, AND ANOTHER PART OF SAID CYLINDER BEING A COMPRESSION CHAMBER, A PAIR OF TUBES CONNECTING SAID FIRST AND SECOND CYLINDERS FORMING A CLOSED SYSTEM HAVING A WORKING MEDIUM THEREIN, AN ADDITIONAL TUBE CONNECTING ONE END OF SAID SECOND CYLINDER WITH THE OTHER END THEREOF, SAID EXPANSION PISTON BEING DOUBLE-ACTING AND HAVING ITS SURFACE REMOTE FROM THE EXPANSION CHAMBER OF THE CYLINDER VARYING THE VOLUM OF A SPACE CONNECTED TO THE ADDITIONAL TUBE WHICH SERVES AS AN ADDITIONAL COMPRESSION STAGE FOR THE WORKING MEDIUM FOLLOWING FROM THE COMPRESSOR THROUGH THE EXPANSION CHAMBER OF SAID REFRIGERATOR, SAID EXPANSION CHAMBER BEING PROVIDED WITH INLET AND OUTLET VALVES AND SAID COMPRESSION CHAMBER BEING PROVIDED WITH A PLURALITY OF CHECK VALVES.
Claim 2
Dependent Claim
152 words
A REFRIGERATOR COMPRISING A FIRST CYLINDER HAVING A COMPRESSION PISTON RECIPROCATING THEREIN AND A SECOND CYLINDER WITH AN EXPANSION PISTON RECIPROCATING THEREIN AND PART OF SAID SECOND CYLINDER BEING AN EXPANSION CHAMBER HAVING A REGERERATOR THEREIN, AND ANOTHER PART OF SAID CYLINDER BEING A COMPRESSION CHAMBER, A PAIR OF TUBES CONNECTING SAID FIRST AND SECOND CYLINDERS FORMING A CLOSED SYSTEM HAVING A WORKING MEDIUM THEREIN, AN ADDITIONAL TUBE CONNECTING ONE END OF SAID SECOND CYLINDER WITH THE OTHER END THEREOF, SAID EXPANSION PISTON BEING DOUBLE-ACTING AND HAVING ITS SURFACE REMOTE FROM THE EXPANSION CHAMBER OF THE CYLINDER VARYING THE VOLUM OF A SPACE CONNECTED TO THE ADDITIONAL TUBE WHICH SERVES AS AN ADDITIONAL COMPRESSION STAGE FOR THE WORKING MEDIUM FOLLOWING FROM THE COMPRESSOR THROUGH THE EXPANSION CHAMBER OF SAID REFRIGERATOR, SAID EXPANSION CHAMBER BEING PROVIDED WITH INLET AND OUTLET VALVES AND SAID COMPRESSION CHAMBER BEING PROVIDED WITH A PLURALITY OF CHECK VALVES.
References Cited (Backward Citations)
US2484392A
Cited
US2856756A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-02-25 | 1966-08-27 | 1967-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-02-25 | 1970-08-27 | 1971-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-02-25 | 1974-08-27 | 1975-02-26 | $7700.00 | Window Closed / Lapsed |