US3323314A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cold-gas refrigerator
Assignee: US Philips Corp
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Filing: 1966-02-17
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Granted: 1967-06-06
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Expires: 1986-02-17
Abstract
No abstract record available.
Inventors
- 👤 Dros Albert August
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:22
CPC Classifications
F; F02; F02G; F02G1/00; F02G1/04; F02G1/043; F25; F25B; F25B9/00; F25B9/14; F02G2243/00; F02G2243/02; F02G2243/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
179 words
A COLD-GAS REFRIGERATOR OF THE TWO-PISTON TYPE HAVING A CRANKCASE COMPRISING AT LEAST ONE CYLINDER, AT LEAST ONE COMPRESSION PISTON AND AT LEAST ONE EXPANSION PISTON RECIPROCATING WITH A MUTUAL PHASE DIFFERECE AND TOGETHER WITH THE CYLINDER DEFINING A COMPRESSION SPACE AND AN EXPANSION SPACE, THE CENTER LINES OF SAID PISTONS BEING SUBSTANTIALLY COINCIDENT, SAID PISTONS BEING ADAPTED TO VARY THROUGH THEIR ADJACENT SURFACES THE VOLUME OF SAID COMPRESSION AND EXPANSION SPACES, SAID SPACES HAVING A DIFFERENT MEAN TEMPERATURE, COMMUNICATING MEANS BETWEEN SAID COMPRESSION AND EXPANSION SPACES INCLUDING A REGENERATOR, AN ADDITIONAL EXPANSION SPACES INCLUDING VOLUME, MEANS CONNECTING SAID ADDITIONAL EXPANSION SPACE WITH THE COMMUNICATING MEANS BETWEEN SAID COMPRESSION AND EXPANSION SPACES WHICH IS LOCATED BETWEEN THE END SURFACES OF SAID REGENERATOR, THE EXPANSION SPACE HAVING THE LOWEST MEAN TEMPERATURE BEING LOCATED FURTHER AWAY FROM SAID CRANKCASE THAN SAID ADDITIONAL EXPANSION SPACE, THE LATTER SURROUNDING SAID EXPANSION PISTON, SAID EXPANSION PISTON HAVING SURFACES WHICH CAN VARY THE VOLUME OF SAID ADDITIONAL EXPANSION SPACE, AND SAID REGENERATOR HAVING STEPPED PORTIONS WITH THE SMALLEST PORTION BEING CLOSER TO SAID EXPANSION SPACE.
Claim 2
Dependent Claim
179 words
A COLD-GAS REFRIGERATOR OF THE TWO-PISTON TYPE HAVING A CRANKCASE COMPRISING AT LEAST ONE CYLINDER, AT LEAST ONE COMPRESSION PISTON AND AT LEAST ONE EXPANSION PISTON RECIPROCATING WITH A MUTUAL PHASE DIFFERECE AND TOGETHER WITH THE CYLINDER DEFINING A COMPRESSION SPACE AND AN EXPANSION SPACE, THE CENTER LINES OF SAID PISTONS BEING SUBSTANTIALLY COINCIDENT, SAID PISTONS BEING ADAPTED TO VARY THROUGH THEIR ADJACENT SURFACES THE VOLUME OF SAID COMPRESSION AND EXPANSION SPACES, SAID SPACES HAVING A DIFFERENT MEAN TEMPERATURE, COMMUNICATING MEANS BETWEEN SAID COMPRESSION AND EXPANSION SPACES INCLUDING A REGENERATOR, AN ADDITIONAL EXPANSION SPACES INCLUDING VOLUME, MEANS CONNECTING SAID ADDITIONAL EXPANSION SPACE WITH THE COMMUNICATING MEANS BETWEEN SAID COMPRESSION AND EXPANSION SPACES WHICH IS LOCATED BETWEEN THE END SURFACES OF SAID REGENERATOR, THE EXPANSION SPACE HAVING THE LOWEST MEAN TEMPERATURE BEING LOCATED FURTHER AWAY FROM SAID CRANKCASE THAN SAID ADDITIONAL EXPANSION SPACE, THE LATTER SURROUNDING SAID EXPANSION PISTON, SAID EXPANSION PISTON HAVING SURFACES WHICH CAN VARY THE VOLUME OF SAID ADDITIONAL EXPANSION SPACE, AND SAID REGENERATOR HAVING STEPPED PORTIONS WITH THE SMALLEST PORTION BEING CLOSER TO SAID EXPANSION SPACE.
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) | 1970-06-05 | 1970-12-05 | 1971-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-06-05 | 1974-12-05 | 1975-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-06-05 | 1978-12-05 | 1979-06-06 | $7700.00 | Window Closed / Lapsed |