US3302422A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refrigeration apparatus
Assignee: Petrocarbon Developments Ltd
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Filing: 1964-04-07
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Granted: 1967-02-07
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Expires: 1984-04-07
Abstract
No abstract record available.
Inventors
- 👤 Howard John Treweek Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:13
CPC Classifications
F; F17; F17C; F17C3/00; F17C3/02; F17C3/08; F17C3/085; F25; F25B; F25B9/00; F25B9/002; F25B9/004; H; H01; H01F; H01F6/00; H01F6/04
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
103 words
A METHOD OF PRODUCING REFRIGERATION WHICH COMPRISES REPEATEDLY PERFORMING THE CYCLE OF ADMITTING COMPRESSED GAS TO A RELATIVELY LONG AND NARROW CHAMBER THROUGH AN INLET SITUATED AT ONE END THEREOF, WITH ABSTRACTION OF HEAT FROM THE GAS BEFORE IT ENTERS THE CHAMBER COOLING GAS IN THE CHAMBER BY INDIRECT HEAT EXCHANGE NEAR THE END THEREOF REMOTE FROM THE INLET, AND EXHAUSTING COMPRESSED GAS FROM THE CHAMBER THROUGH THE INLET WITH EXPANSION THEREOF WITHIN THE CHAMBER AND WITH RETURN OF ABSTRACTED HEAT TO THE GAS AFTER IT LEAVES THE CHAMBER, WHEREBY REFRIGERATION IS MADE AVAILABLE AT THE END OF THE CHAMBER ADJACENT THE INLET.
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) | 1970-02-06 | 1970-08-08 | 1971-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-06 | 1974-08-08 | 1975-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-06 | 1978-08-08 | 1979-02-07 | $7700.00 | Window Closed / Lapsed |