Patent US2751762A successfully refreshed from Google Patents.
US2751762A
Expired / Lapsed
US
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Method of freezing materials
Assignee: Proctor Drying and Freezing Corp
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Filing: 1952-08-08
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Granted: 1956-06-26
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Expires: 1972-08-08
Abstract
No abstract record available.
Inventors
- 👤 Ralph F Colton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:03
CPC Classifications
F; F25; F25C; F25C1/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
THE METHOD OF FREEZING MATERIAL BY DIRECT CONTACT WITH A FRIGID LIQUID WITH WHICH THE MATERIAL IS IMMISCIBLE AND IN A LIMITED SPACE WHICH COMPRISES THE STEPS OF FEEDING THE MATERIAL INTO A COLUMN OF FRIGIG LIQUID HAVING A SPECIFIC GRAVITY AT THE NORMAL OPERATING TEMPERATURE OF THE FRIGIG LIQUID WHICH DIFFERS FROM THAT OF THE MATERIAL BY A PRESELECTED AMOUNT BETWEEN THREE PERCENT AND TEN PERCENT OF THE SPECIFIC GRAVITY OF THE FRIGIG LIQUID, ALLOWING THE MATERIAL TO MOVE THROUGH THE FRIGID LIQUID BY VIRTUE OF THE AFORESAID DIFFERENCE OF SPECIFIC GRAVITY UNTIL THE MATERIAL IS FROZEN, AND THEN SEPARATING THE FROZEN MATERIAL FROM
Claim 2
Independent Claim
105 words
THE METHOD OF FREEZING MATERIAL BY DIRECT CONTACT WITH A FRIGID LIQUID WITH WHICH THE MATERIAL IS IMMISCIBLE AND IN A LIMITED SPACE WHICH COMPRISES THE STEPS OF FEEDING THE MATERIAL INTO A COLUMN OF FRIGIG LIQUID HAVING A SPECIFIC GRAVITY AT THE NORMAL OPERATING TEMPERATURE OF THE FRIGIG LIQUID WHICH DIFFERS FROM THAT OF THE MATERIAL BY A PRESELECTED AMOUNT BETWEEN THREE PERCENT AND TEN PERCENT OF THE SPECIFIC GRAVITY OF THE FRIGIG LIQUID, ALLOWING THE MATERIAL TO MOVE THROUGH THE FRIGID LIQUID BY VIRTUE OF THE AFORESAID DIFFERENCE OF SPECIFIC GRAVITY UNTIL THE MATERIAL IS FROZEN, AND THEN SEPARATING THE FROZEN MATERIAL FROM
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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) | 1959-06-26 | 1959-12-26 | 1960-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-26 | 1963-12-26 | 1964-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-26 | 1967-12-26 | 1968-06-26 | $7700.00 | Window Closed / Lapsed |