Patent US2931841A successfully refreshed from Google Patents.
US2931841A
Expired / Lapsed
US
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Fractional crystallization process
Assignee: Phillips Petroleum Co
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Filing: 1954-05-20
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Granted: 1960-04-05
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Expires: 1974-05-20
Abstract
No abstract record available.
Inventors
- 👤 Vault Albert N De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:08
CPC Classifications
B; B01; B01D; B01D9/00; B01D9/0004; B01D9/0059
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
IN A CONTINUOUS PROCESS FOR SEPARATING A CRYSTALLIZABLE COMPONENT FOR A LIQUID MULTI-COMPONENT MIXTURE, SAID COMPONENT TENDING TO FORM SMALL NEEDLE LIKE CRYSTALS UPON COOLING OF SAID MIXTURE, WHICH COMPRISES COOLING SAID MIXTURE IN A COOLING ZONE SO AS TO CRYSTALLIZED SAID COMPONENT, REMOVING CRYSTALLIZED MATERIAL AND MOTHER LIQUOR FROM SAID COOLING ZONE, PASSING A FIRST PORTION OF SAID CRYSTALLIZED MATERIAL AND MOTHER LIQUOR INTO A FILTER ZONE, SEPARATING MOTHER LIQUOR FROM SAID FIRST PORTION IN SAID FILTER ZONE SO AS TO FORM A CONCENTRATE OF SAID COMPONENT, PASSING SAID CONCENTRATE AS A LIQUID INTO SAID COOLING ZONE, PASSING CRYSTALS OF A SECOND PORTION OF SAID CRYSTALLIZED MATERIAL AND MOTHER LIQUOR INTO A CRYSTAL SEPARATION AND PURIFICATION ZONE, AND RE COVERING PURIFIED CRYSTALLIZABLE MATERIAL FROM SAID CRYSTAL SEPARATION AND PURIFICATION ZONE AS PRODUCT.
Claim 2
Dependent Claim
133 words
IN A CONTINUOUS PROCESS FOR SEPARATING A CRYSTALLIZABLE COMPONENT FOR A LIQUID MULTI-COMPONENT MIXTURE, SAID COMPONENT TENDING TO FORM SMALL NEEDLE LIKE CRYSTALS UPON COOLING OF SAID MIXTURE, WHICH COMPRISES COOLING SAID MIXTURE IN A COOLING ZONE SO AS TO CRYSTALLIZED SAID COMPONENT, REMOVING CRYSTALLIZED MATERIAL AND MOTHER LIQUOR FROM SAID COOLING ZONE, PASSING A FIRST PORTION OF SAID CRYSTALLIZED MATERIAL AND MOTHER LIQUOR INTO A FILTER ZONE, SEPARATING MOTHER LIQUOR FROM SAID FIRST PORTION IN SAID FILTER ZONE SO AS TO FORM A CONCENTRATE OF SAID COMPONENT, PASSING SAID CONCENTRATE AS A LIQUID INTO SAID COOLING ZONE, PASSING CRYSTALS OF A SECOND PORTION OF SAID CRYSTALLIZED MATERIAL AND MOTHER LIQUOR INTO A CRYSTAL SEPARATION AND PURIFICATION ZONE, AND RE COVERING PURIFIED CRYSTALLIZABLE MATERIAL FROM SAID CRYSTAL SEPARATION AND PURIFICATION ZONE AS PRODUCT.
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) | 1963-04-05 | 1963-10-05 | 1964-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-05 | 1967-10-05 | 1968-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-05 | 1971-10-05 | 1972-04-05 | $7700.00 | Window Closed / Lapsed |