US2904412A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crystal separation and purification
Assignee: Phillips Petroleum Co
•
Filing: 1953-12-28
•
Granted: 1959-09-15
•
Expires: 1973-12-28
Abstract
No abstract record available.
Inventors
- 👤 John A Mcbride
- 👤 Richard M Green
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:14
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/14; B; B01; B01D; B01D33/00; B01D33/06; B01D33/073; B01D33/09; B01D33/44; B01D33/46; B01D33/463; B01D33/466; B01D9/00; B01D9/0004; B01D9/0013
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
164 words
A PROCESS FOR SEPARATING A COMPONENT FROM A LIQUID MULTI-COMPONENT MIXTURE WHICH COMPRISES COATING THE OUTER SURFACE OF A FILTERING MEANS WITH A LAYER OF CRYSTALS FORMED BY SAID COMPONENT BY COOLING SAID MIXTURE; COMPRESSING SAID LAYER OF CRYSTALS; SUBJECTING THE COMPRESSED LAYER OF CRYSTALS TO A FIRST WASHING BY A FIRST WASH LIQUID THE WASH LIQUID BEING AT SUCH A TEMPERATURE THAT MELTING OF THE CRYSTALS IS MAINTAINED AT A MINIMUM; APPLYING A SUCTION TO THE INNER SURFACE OF THE WASHED LAYER OF CRYSTALS SO AS TO REMOVE THE FIRST WASH LIQUID; SUBJECTING THE LAYER OF CRYSTALS TO A SECOND WASHING, THE SECOND WASH LIQUID BEING AT SUCH A TEMPERATURE THAT A PORTION OF THE CRYSTALS ARE MELTED; APPLYING A SUCTION TO THE INNER SURFACE OF SAID LAYER OF CRYSTALS SO AS TO DRAW THE SECOND WASH LIQUID AND THE RESULTING MELT AS REFLUX THROUGH SAID CRYSTALS AND IN INTIMATE CONTACT THEREWITH; AND RECOVERING THE WASHED LAYER OF CRYSTALS AS SUBSTANTIALLY PURE PRODUCT.
Claim 2
Dependent Claim
164 words
A PROCESS FOR SEPARATING A COMPONENT FROM A LIQUID MULTI-COMPONENT MIXTURE WHICH COMPRISES COATING THE OUTER SURFACE OF A FILTERING MEANS WITH A LAYER OF CRYSTALS FORMED BY SAID COMPONENT BY COOLING SAID MIXTURE; COMPRESSING SAID LAYER OF CRYSTALS; SUBJECTING THE COMPRESSED LAYER OF CRYSTALS TO A FIRST WASHING BY A FIRST WASH LIQUID THE WASH LIQUID BEING AT SUCH A TEMPERATURE THAT MELTING OF THE CRYSTALS IS MAINTAINED AT A MINIMUM; APPLYING A SUCTION TO THE INNER SURFACE OF THE WASHED LAYER OF CRYSTALS SO AS TO REMOVE THE FIRST WASH LIQUID; SUBJECTING THE LAYER OF CRYSTALS TO A SECOND WASHING, THE SECOND WASH LIQUID BEING AT SUCH A TEMPERATURE THAT A PORTION OF THE CRYSTALS ARE MELTED; APPLYING A SUCTION TO THE INNER SURFACE OF SAID LAYER OF CRYSTALS SO AS TO DRAW THE SECOND WASH LIQUID AND THE RESULTING MELT AS REFLUX THROUGH SAID CRYSTALS AND IN INTIMATE CONTACT THEREWITH; AND RECOVERING THE WASHED LAYER OF CRYSTALS AS SUBSTANTIALLY PURE PRODUCT.
References Cited (Backward Citations)
US1836212A
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US2135605A
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US2268788A
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US2637749A
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US2651922A
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US2670083A
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US2592490A
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US2737508A
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US2614134A
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US2612594A
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US2781294A
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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) | 1962-09-14 | 1963-03-16 | 1963-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-14 | 1967-03-16 | 1967-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-14 | 1971-03-16 | 1971-09-15 | $7700.00 | Window Closed / Lapsed |