Patent US2940272A successfully refreshed from Google Patents.
US2940272A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation by crystallization
Assignee: Phillips Petroleum Co
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Filing: 1955-01-03
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Granted: 1960-06-14
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Expires: 1975-01-03
Abstract
No abstract record available.
Inventors
- 👤 Leo B Croley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:57
CPC Classifications
B; B01; B01D; B01D9/00; B01D9/0004; B01D9/0013; B01D9/004; B01D9/0063; C; C07; C07C; C07C7/00; C07C7/14; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2514; Y10T137/2521; Y10T137/2529
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
168 words
IN A PROCESS FOR CARRYING OUT FRACTIONAL CRYSTALLIZATION SO AS TO SUPPLY A CRYSTAL SLURRY HAVING A SUBSTANTIALLY CONSTANT SOLIDS CONTENT TO A CRYSTAL PURIFICATION ZONE IN WHICH PROCESS A LIQUID FEED STREAM MIXTURE IS PASSED TO A PRE-CONCENTRATION ZONE COMPRISING A COOLING ZONE AND A FILTERING ZONE, A REFRIGERANT IS PASSED IN HEAT EXCHANGE RELATIOHSHIP WITH SAID FEED MIXTURE IN SAID COOLING ZONE SO AS TO COOL SAID FEED MIXTURE TO OBTAIN A SLURRY OF CRYSTALS OF A COMPONENT OF SAID MIXTURE IN NON-CRYSTAL LINE MATERIAL THEREOF, SAID SLURRY OF CRYSTALS AND NON-CRYSTALLINE MATERIAL ARE PASSED FROM SAID COOLING ZONE TO SAID FILTERING ZONE, SAID SLURRY IS FILTERED TO PRODUCE NONCRYSTALLINE MATERIAL (A) AND CRYSTALS (B) OF SAID COMPONENT AND ADHERING NON-CRYSTALLINE MATERIAL, SAID NONCRYSTALLINE MATERIAL (A) IS REMOVED FROM SAID FILTERING ZONE, SAID CRYSTALS (B) AND ADHERING NON-CRYSTALLINE MATERIAL ARE PASSED TO A CRYSTAL PURIFICATION ZONE, SAID CRYSTALS (B) AND ADHERING NON-CRYSTALLINE MATERIAL ARE MOVED AS A COMPACT MASS THROUGH SAID PURIFICATION ZONE TO A MELT-
Claim 2
Dependent Claim
168 words
IN A PROCESS FOR CARRYING OUT FRACTIONAL CRYSTALLIZATION SO AS TO SUPPLY A CRYSTAL SLURRY HAVING A SUBSTANTIALLY CONSTANT SOLIDS CONTENT TO A CRYSTAL PURIFICATION ZONE IN WHICH PROCESS A LIQUID FEED STREAM MIXTURE IS PASSED TO A PRE-CONCENTRATION ZONE COMPRISING A COOLING ZONE AND A FILTERING ZONE, A REFRIGERANT IS PASSED IN HEAT EXCHANGE RELATIOHSHIP WITH SAID FEED MIXTURE IN SAID COOLING ZONE SO AS TO COOL SAID FEED MIXTURE TO OBTAIN A SLURRY OF CRYSTALS OF A COMPONENT OF SAID MIXTURE IN NON-CRYSTAL LINE MATERIAL THEREOF, SAID SLURRY OF CRYSTALS AND NON-CRYSTALLINE MATERIAL ARE PASSED FROM SAID COOLING ZONE TO SAID FILTERING ZONE, SAID SLURRY IS FILTERED TO PRODUCE NONCRYSTALLINE MATERIAL (A) AND CRYSTALS (B) OF SAID COMPONENT AND ADHERING NON-CRYSTALLINE MATERIAL, SAID NONCRYSTALLINE MATERIAL (A) IS REMOVED FROM SAID FILTERING ZONE, SAID CRYSTALS (B) AND ADHERING NON-CRYSTALLINE MATERIAL ARE PASSED TO A CRYSTAL PURIFICATION ZONE, SAID CRYSTALS (B) AND ADHERING NON-CRYSTALLINE MATERIAL ARE MOVED AS A COMPACT MASS THROUGH SAID PURIFICATION ZONE TO A MELT-
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) | 1963-06-14 | 1963-12-14 | 1964-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-14 | 1967-12-14 | 1968-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-14 | 1971-12-14 | 1972-06-14 | $7700.00 | Window Closed / Lapsed |