US3609982A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cryogenic cycle and apparatus for refrigerating a fluid
Assignee: Cryogenic Technology Inc
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Filing: 1970-05-18
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Granted: 1971-10-05
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Expires: 1990-05-18
Abstract
Abstract METHOD AND APPARATUS FOR COOLING AND LIQUEFYING A REFRIGERATAED FLUID SUCH AS HYDROGEN. A SMALL AMOUNT OF COLD REFRIGERATING FLUID, BLED OFF FROM A CRYOGENIC REFRIGERATOR OR LIQUEFIER, IS USED TO COOL THE REFRIGERATED FLUID OVER A TEMPERATURE RANGE. FINAL COOLING AND LIQUEFACTION IF DESIRED IS THEN ACCOMPLISHED AT ESSENTIALLY CONSTANT TEMPERATURE. THE RESULT IS MORE EFFECIENT USE OF THE REFRIGERATING FLUID.
Inventors
- 👤 James A O'neil
- 👤 Robert W Stuart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:37
CPC Classifications
F; F25; F25B; F25B9/00; F25B9/14; F25J; F25J1/00; F25J1/0002; F25J1/0005; F25J1/001; F25J1/02; F25J1/0225; F25J2270/00; F25J2270/90; F25J2270/908
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1974-10-04 | 1975-04-05 | 1975-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-04 | 1979-04-05 | 1979-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-04 | 1983-04-05 | 1983-10-05 | $7700.00 | Window Closed / Lapsed |