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US3613385A
Expired / Lapsed
US
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Cryogenic cycle and apparatus
Assignee: Cryogenic Technology Inc
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Filing: 1969-06-12
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Granted: 1971-10-19
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Expires: 1989-06-12
Abstract
Abstract AN APPARATUS SUITABLE FOR DEVELOPING CRYOGENIC TEMPERATURES. INCOMING HIGH-PRESSURE FLUID IS EXPANDED AND FURTHER COOLED AFTER BEING INITIALLY COOLED BY HEAT EXCHANGE WITH RETURNING LOW-PRESSURE FLUID. AT LEAST A PORTION OF THE WORK DEVELOPED IN THE EXPANDER IS EXTRACTED BY COMPRESSING A FLUID WHICH IS CIRCULATED BACK AND FORTH BETWEEN THE EXPANSION CHAMBER AND A BALANCING CHAMBER IN WHICH THE COMPRESSION TAKES PLACE. MEANS ARE PROVIDED TO REMOVE THE HEAT OF COMPRESSION THROUGH HEAT EXCHANGE.
Inventors
- 👤 Walter H Hogan
- 👤 Robert W Stuart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:51
CPC Classifications
F; F25; F25B; F25B9/00; F25B9/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-18 | 1975-04-19 | 1975-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-18 | 1979-04-19 | 1979-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-18 | 1983-04-19 | 1983-10-19 | $7700.00 | Window Closed / Lapsed |