US3345828A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Parallel flow cryogenic freezer
Assignee: Air Products and Chemicals Inc
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Filing: 1965-06-11
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Granted: 1967-10-10
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Expires: 1985-06-11
Abstract
No abstract record available.
Inventors
- 👤 David J Klee
- 👤 Raymond L Berreth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:34
CPC Classifications
F; F25; F25D; F25D3/00; F25D3/10; F25D3/11
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
154 words
A METHOD FOR ULTRA-FAST FREEZING OF PRODUCTS WITH A CRYOGENIC REFRIGERANT INCLUDING THE STEPS OF: (A) CONTINUOUSLY MOVING SAID PRODUCT TO BE FROZEN THROUGH AN INSULATED TUNNEL ALONG A PREDETERMINED PATH; (B)CONTINUOUSLY CONTACTING SAID PRODUCT WITH A CRYOGENIC LIQUID IN SAID TUNNEL TO FREEZE THE PRODUCT WHILE VAPORIZING THE CRYOGENIC LIQUID TO FORM A COLD GAS; (C) CONTINUOUSLY COLLECTING SAID COLD GAS RESULTING FROM SAID VAPORIZATION IN A PORTION OF SAID TUNNEL; (D) CONTINUOUSLY RECIRCULATING THE MAJOR PORTION OF SAID COLLECTED GAS THROUGH A SUBSTANTIALLY CLOSED PATH AT LEAST ONE-HALF OF WHICH CLOSED PATH IS PARALLEL TO AND COINCIDENT WITH SAID PREDETERMINED PATH ALONG A SUBSTANTIAL EXTENT THEREOF; (E) CONTINUOUSLY ADDING COLD GAS RESULTING FROM NEWLY VAPORIZED CRYOGENIC LIQUID TO SAID RECIRCULATION PATH; (F) CONTINUOUSLY REMOVING SOME OF SAID RECIRCULATED GAS FROM SAID CLOSED PATH IN AN AMOUNT WHICH IS SUBSTANTIALLY EQUAL TO THE AMOUNT OF COLD GAS CONTINUOUSLY ADDED TO SAID RECIRCULATION PATH;
Claim 2
Independent Claim
154 words
A METHOD FOR ULTRA-FAST FREEZING OF PRODUCTS WITH A CRYOGENIC REFRIGERANT INCLUDING THE STEPS OF: (A) CONTINUOUSLY MOVING SAID PRODUCT TO BE FROZEN THROUGH AN INSULATED TUNNEL ALONG A PREDETERMINED PATH; (B)CONTINUOUSLY CONTACTING SAID PRODUCT WITH A CRYOGENIC LIQUID IN SAID TUNNEL TO FREEZE THE PRODUCT WHILE VAPORIZING THE CRYOGENIC LIQUID TO FORM A COLD GAS; (C) CONTINUOUSLY COLLECTING SAID COLD GAS RESULTING FROM SAID VAPORIZATION IN A PORTION OF SAID TUNNEL; (D) CONTINUOUSLY RECIRCULATING THE MAJOR PORTION OF SAID COLLECTED GAS THROUGH A SUBSTANTIALLY CLOSED PATH AT LEAST ONE-HALF OF WHICH CLOSED PATH IS PARALLEL TO AND COINCIDENT WITH SAID PREDETERMINED PATH ALONG A SUBSTANTIAL EXTENT THEREOF; (E) CONTINUOUSLY ADDING COLD GAS RESULTING FROM NEWLY VAPORIZED CRYOGENIC LIQUID TO SAID RECIRCULATION PATH; (F) CONTINUOUSLY REMOVING SOME OF SAID RECIRCULATED GAS FROM SAID CLOSED PATH IN AN AMOUNT WHICH IS SUBSTANTIALLY EQUAL TO THE AMOUNT OF COLD GAS CONTINUOUSLY ADDED TO SAID RECIRCULATION PATH;
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) | 1970-10-09 | 1971-04-10 | 1971-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-09 | 1975-04-10 | 1975-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-09 | 1979-04-10 | 1979-10-10 | $7700.00 | Window Closed / Lapsed |