US2868830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation by crystallization
Assignee: Phillips Petroleum Co
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Filing: 1954-10-18
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Granted: 1959-01-13
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Expires: 1974-10-18
Abstract
No abstract record available.
Inventors
- 👤 John A Weedman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:28
CPC Classifications
B; B01; B01D; B01D9/00; B01D9/0004; B01D9/0013; B01D9/004
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
204 words
A PROCESS FOR THE PURIFICATION OF CRYSTALS OF AN ORGANIC COMPOUND PURIFIABLE BY FRACTIONAL CRYSTALLIZATION WHICH PROCESS COMPRISES MOVING SAID CRYSTALS AND ASSOCIATED IMPURITIES TOWARD ONE END OF A FIRST ELONGATED ZONE AS A COMPACT MASS; MELTING A PORTION OF SAID CRYSTALS AT THE DOWNSTREAM END PORTION OF SAID FIRST ELONGATED ZONE; COMPACTING SAID CRYSTALS IN SAID ZONE WITHOUT SUBSTANTIAL REFLUX OF MELT FROM THE DOWNSTREAM END OF SAID ZONE INTO SAID CRYSTAL MASS; CHILLING LIQUID MATERIAL FROM THE DOWNSTREAM END OF SAID FIRST ELONGATED ZONE SO AS TO FORM CRYSTALS OF AT LEAST A PORTION OF ONE CONSTITUENT OF SAID MIXTURE AT A TEMPERATURE HIGHER THAN THE TEMPERATURE OF THE CRYSTAL MATERIAL IN SAID FIRST ZONE; INTRODUCING SAID NEWLY FORMED CRYSTALS INTO A SECOND ELONGATED ZONE; MOVING SAID CRYSTALS TOWARD ONE END OF SAID ZONE AS A COMPACT MASS; MELTING AT LEAST A PORTION OF SAID CRYSTALS IN THE DOWNSTREAM END PORTION OF SAID SECOND ZONE; DISPLACING A PORTION OF THE RESULTING MELT COUNTERCURRENTLY THROUGH A PORTION OF SAID CRYSTAL MASS SO AS TO DISPLACE OCCLUDED IMPURITIES THEREFROM; REMOVING SAID DISPLACED MATERIALS FROM AN UPSTREAM PORTION OF SAID SECOND ZONE; AND REMOVING A PURIFIED PRODUCT FROM THE DOWNSTREAM PORTION OF SAID SECOND ZONE.
Claim 2
Dependent Claim
204 words
A PROCESS FOR THE PURIFICATION OF CRYSTALS OF AN ORGANIC COMPOUND PURIFIABLE BY FRACTIONAL CRYSTALLIZATION WHICH PROCESS COMPRISES MOVING SAID CRYSTALS AND ASSOCIATED IMPURITIES TOWARD ONE END OF A FIRST ELONGATED ZONE AS A COMPACT MASS; MELTING A PORTION OF SAID CRYSTALS AT THE DOWNSTREAM END PORTION OF SAID FIRST ELONGATED ZONE; COMPACTING SAID CRYSTALS IN SAID ZONE WITHOUT SUBSTANTIAL REFLUX OF MELT FROM THE DOWNSTREAM END OF SAID ZONE INTO SAID CRYSTAL MASS; CHILLING LIQUID MATERIAL FROM THE DOWNSTREAM END OF SAID FIRST ELONGATED ZONE SO AS TO FORM CRYSTALS OF AT LEAST A PORTION OF ONE CONSTITUENT OF SAID MIXTURE AT A TEMPERATURE HIGHER THAN THE TEMPERATURE OF THE CRYSTAL MATERIAL IN SAID FIRST ZONE; INTRODUCING SAID NEWLY FORMED CRYSTALS INTO A SECOND ELONGATED ZONE; MOVING SAID CRYSTALS TOWARD ONE END OF SAID ZONE AS A COMPACT MASS; MELTING AT LEAST A PORTION OF SAID CRYSTALS IN THE DOWNSTREAM END PORTION OF SAID SECOND ZONE; DISPLACING A PORTION OF THE RESULTING MELT COUNTERCURRENTLY THROUGH A PORTION OF SAID CRYSTAL MASS SO AS TO DISPLACE OCCLUDED IMPURITIES THEREFROM; REMOVING SAID DISPLACED MATERIALS FROM AN UPSTREAM PORTION OF SAID SECOND ZONE; AND REMOVING A PURIFIED PRODUCT FROM THE DOWNSTREAM PORTION OF SAID SECOND ZONE.
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) | 1962-01-12 | 1962-07-14 | 1963-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-12 | 1966-07-14 | 1967-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-12 | 1970-07-14 | 1971-01-13 | $7700.00 | Window Closed / Lapsed |