US3238736A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid nitrogen freezing system
Assignee: Elmwood Liquid Products Inc
•
Filing: 1963-05-16
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Granted: 1966-03-08
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Expires: 1983-05-16
Abstract
No abstract record available.
Inventors
- 👤 Hamish K Macintosh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:47
CPC Classifications
F; F25; F25D; F25D3/00; F25D3/10; F25D3/11; A; A23; A23B; A23B2/00; A23B2/80; A23B2/803; A23B2/8033; A23B2/82; A23B7/00; A23B7/04; A23B7/0408
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
THE METHOD OF FREEZING PERISHABLES WHOSE BODIES ARE SUSCEPTIBLE TO PHSYICAL INJURY WHEN SUBJECTED TO LIQUID NITROGEN, COMPRISING THE STEPS OF: (A) ADVANCING THE PERISHABLES TO BE FROZEN THROUGH AN ELONGATED TUNNEL FROM AN OPEN INLET THEREIN TO AN OPEN OUTLET, (B) SUBJECTING THE PERISHABLES AT A POSITION IN SAID TUNNEL ADJACENT SAID OUTLET TO LIQUID NITROGEN TO EFFECT FREEZING OF SAID PERISHABLES AND TO CAUSE SAID LIQUID NITROGEN TO VOLATILIZE AND THEREBY FORM A COLD GAS, (C) AND FORCING SUBSTANTIALLY ALL OF SAID COLD GAS TOWARD SAID INLET IN COUNTERCURRENT RELATIONSHIP TO THE PERISHABLES AND IN HEAT EXCHANGE RELATIONSHIP THEREWITH TO EFFECT PROGRESSIVE PRE-COOLING OF SAID PERISHABLES AS
Claim 2
Independent Claim
109 words
THE METHOD OF FREEZING PERISHABLES WHOSE BODIES ARE SUSCEPTIBLE TO PHSYICAL INJURY WHEN SUBJECTED TO LIQUID NITROGEN, COMPRISING THE STEPS OF: (A) ADVANCING THE PERISHABLES TO BE FROZEN THROUGH AN ELONGATED TUNNEL FROM AN OPEN INLET THEREIN TO AN OPEN OUTLET, (B) SUBJECTING THE PERISHABLES AT A POSITION IN SAID TUNNEL ADJACENT SAID OUTLET TO LIQUID NITROGEN TO EFFECT FREEZING OF SAID PERISHABLES AND TO CAUSE SAID LIQUID NITROGEN TO VOLATILIZE AND THEREBY FORM A COLD GAS, (C) AND FORCING SUBSTANTIALLY ALL OF SAID COLD GAS TOWARD SAID INLET IN COUNTERCURRENT RELATIONSHIP TO THE PERISHABLES AND IN HEAT EXCHANGE RELATIONSHIP THEREWITH TO EFFECT PROGRESSIVE PRE-COOLING OF SAID PERISHABLES AS
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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) | 1969-03-07 | 1969-09-06 | 1970-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-07 | 1973-09-06 | 1974-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-07 | 1977-09-06 | 1978-03-08 | $7700.00 | Window Closed / Lapsed |