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US2890239A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation by crystallization
Assignee: Phillips Petroleum Co
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Filing: 1954-07-15
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Granted: 1959-06-09
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Expires: 1974-07-15
Abstract
No abstract record available.
Inventors
- 👤 Donald J Quigg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:59
CPC Classifications
B; B01; B01D; B01D9/00; B01D9/0004; B01D9/0013; B01D9/004; B01D9/0059
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
153 words
A PROCESS FOR CONCENTRATING A COMPOUND WHICH EXISTS IN ADMIXTURE WITH OTHER MATERIALS AND IS SEPARABLE THEREFROM BY CRYSTALLIZATION WHICH COMPRISES COOLING SAID ADMIXTURE TO A TEMPERATURE AT WHICH SAID COMPOUND CRYSTALLIZES THEREFROM, RECOVERING CRYSTALS OF SAID COMPOUND, INTRODUCING CRYSTALS OF SAID COMPOUND TO A FIRST ELONGATED PURIFICATION ZONE, MOVING SAID CRYSTALS TOWARD ONE END OF SAID ZONE AS A COMPACT MASS, MELTING A PORTION OF SAID COMPACT CRYSTAL MASS IN A DOWNSTREAM PORTION (WITH RESPECT TO CRYSTAL MOVEMENT) OF SAID ZONE, DISPLACING A PORTION OF THE RESULTING MELT COUNTERCURRENTLY THROUGH A LENGTH OF SAID CRYSTAL MASS SUFFICIENT TO DISPLACE OCCLUDED IMPURITIES THEREFROM BUT INSUFFICIENT TO REDUCE THE TEMPERATURE OF THE MELT TO THE POINT WHERE FREEZING OF THE MELT IN THE INTERSTICES OF THE CRYSTALS TO FORM AN IMPENETRATABLE MASS OCCURS, REMOVING SAID DISPLACED MATERIALS FROM SAID FIRST ELONGATED ZONE, HEATING SAID CRYSTALS TO MELT A PORTION THEREOF AND RAISE THE TEM-
Claim 2
Dependent Claim
153 words
A PROCESS FOR CONCENTRATING A COMPOUND WHICH EXISTS IN ADMIXTURE WITH OTHER MATERIALS AND IS SEPARABLE THEREFROM BY CRYSTALLIZATION WHICH COMPRISES COOLING SAID ADMIXTURE TO A TEMPERATURE AT WHICH SAID COMPOUND CRYSTALLIZES THEREFROM, RECOVERING CRYSTALS OF SAID COMPOUND, INTRODUCING CRYSTALS OF SAID COMPOUND TO A FIRST ELONGATED PURIFICATION ZONE, MOVING SAID CRYSTALS TOWARD ONE END OF SAID ZONE AS A COMPACT MASS, MELTING A PORTION OF SAID COMPACT CRYSTAL MASS IN A DOWNSTREAM PORTION (WITH RESPECT TO CRYSTAL MOVEMENT) OF SAID ZONE, DISPLACING A PORTION OF THE RESULTING MELT COUNTERCURRENTLY THROUGH A LENGTH OF SAID CRYSTAL MASS SUFFICIENT TO DISPLACE OCCLUDED IMPURITIES THEREFROM BUT INSUFFICIENT TO REDUCE THE TEMPERATURE OF THE MELT TO THE POINT WHERE FREEZING OF THE MELT IN THE INTERSTICES OF THE CRYSTALS TO FORM AN IMPENETRATABLE MASS OCCURS, REMOVING SAID DISPLACED MATERIALS FROM SAID FIRST ELONGATED ZONE, HEATING SAID CRYSTALS TO MELT A PORTION THEREOF AND RAISE THE TEM-
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) | 1962-06-08 | 1962-12-08 | 1963-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-06-08 | 1966-12-08 | 1967-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-06-08 | 1970-12-08 | 1971-06-09 | $7700.00 | Window Closed / Lapsed |