Patent US2886587A successfully refreshed from Google Patents.
US2886587A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation by crystallization
Assignee: Phillips Petroleum Co
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Filing: 1954-07-06
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Granted: 1959-05-12
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Expires: 1974-07-06
Abstract
No abstract record available.
Inventors
- 👤 Samuel J Kolner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:03
CPC Classifications
B; B01; B01D; B01D9/00; B01D9/0004; B01D9/0013; B01D9/004; B01D9/0059
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
A PROCESS FOR THE PURIFICATION OF CRYSTALS FORMED AT A FIRST TEMPERATURE WHICH COMPRISES MELTING A MAJOR PORTION OF SAID CRYSTALS TO RELEASE INCLUDED IMPURITIES THEREFROM; CHILLING THE MATERIAL RESULTING FROM THE MELTING STEP SO AS TO RECRYSTALLIZE AT LEAST A PORTION OF ONE COMPONENT THEREOF AT A TEMPERATURE SUBSTANTIALLY HIGHER THAN THE FIRST TEMPERATURE; MOVING CRYSTALS SO FORMED THROUGH AN ELONGATED PURIFICATION ZONE AS A COMPACT MASS; MELTING A PORTION OF SAID CRYSTALS IN A DOWNSTREAM PORTION OF SAID PURIFICATION ZONE; DISPLACING A PORTION OF THE MELT COUNTERCURRENTLY THROUGH AT LEAST A PORTION OF THE LENGTH OF SAID CRYSTAL MASS SO AS TO DISPLACE OCCLUDED IMPURITIES THEREFROM; REMOVING LIQUID DISPLACED FROM SAID CRYSTAL MASS; AND RECOVERING A PURIFIED PRODUCT FROM A DOWN STREAM PORTION OF SAID PURIFICATION ZONE.
Claim 2
Dependent Claim
129 words
A PROCESS FOR THE PURIFICATION OF CRYSTALS FORMED AT A FIRST TEMPERATURE WHICH COMPRISES MELTING A MAJOR PORTION OF SAID CRYSTALS TO RELEASE INCLUDED IMPURITIES THEREFROM; CHILLING THE MATERIAL RESULTING FROM THE MELTING STEP SO AS TO RECRYSTALLIZE AT LEAST A PORTION OF ONE COMPONENT THEREOF AT A TEMPERATURE SUBSTANTIALLY HIGHER THAN THE FIRST TEMPERATURE; MOVING CRYSTALS SO FORMED THROUGH AN ELONGATED PURIFICATION ZONE AS A COMPACT MASS; MELTING A PORTION OF SAID CRYSTALS IN A DOWNSTREAM PORTION OF SAID PURIFICATION ZONE; DISPLACING A PORTION OF THE MELT COUNTERCURRENTLY THROUGH AT LEAST A PORTION OF THE LENGTH OF SAID CRYSTAL MASS SO AS TO DISPLACE OCCLUDED IMPURITIES THEREFROM; REMOVING LIQUID DISPLACED FROM SAID CRYSTAL MASS; AND RECOVERING A PURIFIED PRODUCT FROM A DOWN STREAM PORTION OF SAID PURIFICATION 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) | 1962-05-11 | 1962-11-10 | 1963-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-11 | 1966-11-10 | 1967-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-11 | 1970-11-10 | 1971-05-12 | $7700.00 | Window Closed / Lapsed |