Patent US1879167A successfully refreshed from Google Patents.
Patent US2913344A successfully refreshed from Google Patents.
US2913344A
Expired / Lapsed
US
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Process and apparatus for purification of crystals
Assignee: Phillips Petroleum Co
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Filing: 1955-11-10
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Granted: 1959-11-17
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Expires: 1975-11-10
Abstract
No abstract record available.
Inventors
- 👤 Jr Percy S Stallings
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:40
CPC Classifications
A; A23; A23L; A23L2/00; A23L2/02; A23L2/08; A23L2/12; B; B01; B01D; B01D9/00; B01D9/0004; B01D9/0013; B01D9/004; B01D9/005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
IN A PROCESS IN WHICH CRYSTALS AND ADHERING MOTHER LIQUOR ARE CONTINUOUSLY PASSED AS A SLURRY FROM A CHILLING ZONE AND AN INTERMEDIATE ZONE THROUGH A LIQUID REMOVAL ZONE FROM WHICH MOTHER LIQUOR IS REMOVED, A REFLUX ZONE AND A MELTING ZONE IN WHICH SAID CRYSTALS ARE MELTED, PART OF THE MELT BEING WITHDRAWN FROM THE SYSTEM AND THE REMAINDER BEING REFLUXED INTO THE REFLUX ZONE, THE IMPROVEMENT WHICH COMPRISES ALTERNATELY AND RAPIDLY WITHDRAWING SLURRY FROM AND REINTRODUCING SLURRY TO SAID INTERMEDIATE ZONE THEREBY SUBJECTING MATERIALS IN SAID ZONES TO A RAPIDLY PULSATING PRESSURE DIRECTED IN THE DIRECTION OF THE PASSAGE OF SAID CRYSTALS AT A FREQUENCY IN THE RANGE OF 15 TO 200 CYCLES PER MINUTE.
Claim 2
Dependent Claim
117 words
IN A PROCESS IN WHICH CRYSTALS AND ADHERING MOTHER LIQUOR ARE CONTINUOUSLY PASSED AS A SLURRY FROM A CHILLING ZONE AND AN INTERMEDIATE ZONE THROUGH A LIQUID REMOVAL ZONE FROM WHICH MOTHER LIQUOR IS REMOVED, A REFLUX ZONE AND A MELTING ZONE IN WHICH SAID CRYSTALS ARE MELTED, PART OF THE MELT BEING WITHDRAWN FROM THE SYSTEM AND THE REMAINDER BEING REFLUXED INTO THE REFLUX ZONE, THE IMPROVEMENT WHICH COMPRISES ALTERNATELY AND RAPIDLY WITHDRAWING SLURRY FROM AND REINTRODUCING SLURRY TO SAID INTERMEDIATE ZONE THEREBY SUBJECTING MATERIALS IN SAID ZONES TO A RAPIDLY PULSATING PRESSURE DIRECTED IN THE DIRECTION OF THE PASSAGE OF SAID CRYSTALS AT A FREQUENCY IN THE RANGE OF 15 TO 200 CYCLES PER MINUTE.
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) | 1962-11-16 | 1963-05-18 | 1963-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-16 | 1967-05-18 | 1967-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-16 | 1971-05-18 | 1971-11-17 | $7700.00 | Window Closed / Lapsed |