US3221509A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refrigeration method and apparatus
Assignee: International Business Machines Corp
•
Filing: 1964-01-16
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Granted: 1965-12-07
•
Expires: 1984-01-16
Abstract
No abstract record available.
Inventors
- 👤 Richard L Garwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:28
CPC Classifications
F; F25; F25J; F25J1/00; F25J1/02; F25J1/0243; F25J1/0257; F25J1/0275; F25J1/0276; F25B; F25B9/00; F25B9/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
58 words
REFRIGERATION APPARATUS COMPRISING A HEAT ENGINE, A LOAD ADAPTED TO OPERATE AT CRYOGENIC TEMPERATURES MEANS FOR CYCLICALLY INTRODUCING AND EXHAUSTING A FLUID TO AND FROM SAID HEAT ENGINE WHEREIN SAID FLUID IS COOLED BY A PROCESS OF SUCCESSIVE COMPRESSIONS AND EXPANSIONS, MEANS FOR DELIVERING SAID FLUID TO SAID LOAD AT SUBSTANTIALLY CONSTANT PRESSURE DISPOSED INTERMEDIATE SAID HEAT ENGINE
Claim 2
Dependent Claim
58 words
REFRIGERATION APPARATUS COMPRISING A HEAT ENGINE, A LOAD ADAPTED TO OPERATE AT CRYOGENIC TEMPERATURES MEANS FOR CYCLICALLY INTRODUCING AND EXHAUSTING A FLUID TO AND FROM SAID HEAT ENGINE WHEREIN SAID FLUID IS COOLED BY A PROCESS OF SUCCESSIVE COMPRESSIONS AND EXPANSIONS, MEANS FOR DELIVERING SAID FLUID TO SAID LOAD AT SUBSTANTIALLY CONSTANT PRESSURE DISPOSED INTERMEDIATE SAID HEAT ENGINE
References Cited (Backward Citations)
US1321343A
Cited
US2907175A
Cited
US2906101A
Cited
US2966035A
Cited
US3101596A
Cited
US3115016A
Cited
US3115014A
Cited
US3115015A
Cited
US3148512A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-12-06 | 1969-06-07 | 1969-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-06 | 1973-06-07 | 1973-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-06 | 1977-06-07 | 1977-12-07 | $7700.00 | Window Closed / Lapsed |