US3413818A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Immersion freezing
Assignee: FMC Corp
•
Filing: 1963-12-13
•
Granted: 1968-12-03
•
Expires: 1983-12-13
Abstract
No abstract record available.
Inventors
- 👤 John P Pelmulder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:34
CPC Classifications
F; F25; F25D; F25D3/00; F25D3/10; F25D3/11; A; A23; A23B; A23B2/00; A23B2/80; A23B2/85; A23B2/88; A23B7/00; A23B7/04; A23B7/0408
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
165 words
THE METHOD OF FREEZING CELLULAR ORGANIC PRODUCTS COMPRISING THE STEPS OF PROVIDING A BATH OF LIQUEFIED NITROGEN GAS, PRECOOLING THE PRODUCT IN A BATH OF COLD GAS EVOLVED FROM SAID BATH TO BRING THE PRODUCT TO AN AVERAGE TEMPERATURE THAT IS SLIGHTLY ABOVE FREEZING, SUBJECTING THE PRECOOLED PRODUCT TO THE BATH OF LIQUEFIED NITROGEN GAS TO FORM A RELATIVELY THIN FROZEN CRUST ON THE PRODUCT, TEMPERING THE PARTIALLY FORZEN PRODUCT IN A STATIC BATH OF COLD NITROGEN GAS THAT HAS ENVOLVED FROM THE LIQUID BATH TO DEEPEN THE FROZEN CRUST OF THE PRODUCT AND RAISE ITS SURFACE TEMPERATURE, PASSING THE TEMPERED PRODUCT COUNTERCURRENT TO A DYNAMIC STREAM OF COLD NITROGEN GAS EVOLVED FROM THE LIQUID NITROGEN BATH TO FURTHER DEEPEN THE FROZEN CRUST OF THE PRODUCT SUFFICIENTLY TO CAUSE THE PRODUCT TO FREEZE SOLID UPON REMOVAL THEREOF FROM THE DYNAMIC STREAM OF GAS, MAINTAINING THE PRESSURE OF THE GAS ENTERING THE PRECOOLING BATH SUBTANTIALLY EQUAL TO THAT OF THE GAS EVOLVED FROM THE LIQUID BATH.
Claim 2
Independent Claim
165 words
THE METHOD OF FREEZING CELLULAR ORGANIC PRODUCTS COMPRISING THE STEPS OF PROVIDING A BATH OF LIQUEFIED NITROGEN GAS, PRECOOLING THE PRODUCT IN A BATH OF COLD GAS EVOLVED FROM SAID BATH TO BRING THE PRODUCT TO AN AVERAGE TEMPERATURE THAT IS SLIGHTLY ABOVE FREEZING, SUBJECTING THE PRECOOLED PRODUCT TO THE BATH OF LIQUEFIED NITROGEN GAS TO FORM A RELATIVELY THIN FROZEN CRUST ON THE PRODUCT, TEMPERING THE PARTIALLY FORZEN PRODUCT IN A STATIC BATH OF COLD NITROGEN GAS THAT HAS ENVOLVED FROM THE LIQUID BATH TO DEEPEN THE FROZEN CRUST OF THE PRODUCT AND RAISE ITS SURFACE TEMPERATURE, PASSING THE TEMPERED PRODUCT COUNTERCURRENT TO A DYNAMIC STREAM OF COLD NITROGEN GAS EVOLVED FROM THE LIQUID NITROGEN BATH TO FURTHER DEEPEN THE FROZEN CRUST OF THE PRODUCT SUFFICIENTLY TO CAUSE THE PRODUCT TO FREEZE SOLID UPON REMOVAL THEREOF FROM THE DYNAMIC STREAM OF GAS, MAINTAINING THE PRESSURE OF THE GAS ENTERING THE PRECOOLING BATH SUBTANTIALLY EQUAL TO THAT OF THE GAS EVOLVED FROM THE LIQUID BATH.
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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) | 1971-12-03 | 1972-06-03 | 1972-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-03 | 1976-06-03 | 1976-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-03 | 1980-06-03 | 1980-12-03 | $7700.00 | Window Closed / Lapsed |