Patent US3333433A successfully refreshed from Google Patents.
US3333433A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Closed cycle cryogenic refrigerator
Assignee: 500 Inc
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Filing: 1966-01-26
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Granted: 1967-08-01
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Expires: 1986-01-26
Abstract
No abstract record available.
Inventors
- 👤 Fred F Chellis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:12
CPC Classifications
F; F25; F25B; F25B9/00; F25B9/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
A CLOSED-CYCLE CRYOGENIC REFRIGERATOR, COMPRISING IN COMBINATION (A) A FLUID-TIGHT HOUSING; (B) A PLURALITY OF CHAMBERS AT DIFFERENT TEMPERATURE LEVELS WITHIN SAID HOUSING, THE VOLUMES OF WHICH ARE DEFINED BY THE MOVEMENTS OF (C) FLUID DISPLACING MEANS MOVABLE WITHIN SAID HOUSING AND ADAPTED TO CIRCULATE A PRESSURIZED REFRIGERATING FLUID AMONG SAID CHAMBERS; (D) A FLUID FLOW PATH INCORPORATING HEAT EXCHANGE MEANS CONNECTING SAID CHAMBERS; (E) DRIVING MEANS FOR MOVING SAID FLUID DISPLACING MEANS THROUGH A PREDETERMINED CYCLE; AND (F) A FLUID-TIGHT BOOSTER CHAMBER IN FLUID COMMUNICATION WITH SAID CHAMBERS THROUGH FLUID-FLOW CONTROL MEANS AUTOMATICALLY RESPONSIVE TO A DECREASE IN PRESSURE WTHIN SAID REFRIGERATOR THEREBY TO PROVIDE AN ADDITIONAL QUANTITY OF SAID PRESSURIZED REFRIGERATING FLUID TO SAID REFRIGERATOR DURING COOL DOWN AND FOR CONTINUING OPERATING.
Claim 2
Dependent Claim
124 words
A CLOSED-CYCLE CRYOGENIC REFRIGERATOR, COMPRISING IN COMBINATION (A) A FLUID-TIGHT HOUSING; (B) A PLURALITY OF CHAMBERS AT DIFFERENT TEMPERATURE LEVELS WITHIN SAID HOUSING, THE VOLUMES OF WHICH ARE DEFINED BY THE MOVEMENTS OF (C) FLUID DISPLACING MEANS MOVABLE WITHIN SAID HOUSING AND ADAPTED TO CIRCULATE A PRESSURIZED REFRIGERATING FLUID AMONG SAID CHAMBERS; (D) A FLUID FLOW PATH INCORPORATING HEAT EXCHANGE MEANS CONNECTING SAID CHAMBERS; (E) DRIVING MEANS FOR MOVING SAID FLUID DISPLACING MEANS THROUGH A PREDETERMINED CYCLE; AND (F) A FLUID-TIGHT BOOSTER CHAMBER IN FLUID COMMUNICATION WITH SAID CHAMBERS THROUGH FLUID-FLOW CONTROL MEANS AUTOMATICALLY RESPONSIVE TO A DECREASE IN PRESSURE WTHIN SAID REFRIGERATOR THEREBY TO PROVIDE AN ADDITIONAL QUANTITY OF SAID PRESSURIZED REFRIGERATING FLUID TO SAID REFRIGERATOR DURING COOL DOWN AND FOR CONTINUING OPERATING.
References Cited (Backward Citations)
US3220200A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-07-31 | 1971-01-30 | 1971-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-31 | 1975-01-30 | 1975-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-31 | 1979-01-30 | 1979-08-01 | $7700.00 | Window Closed / Lapsed |