US2854494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for purification of crystals
Assignee: Phillips Petroleum Co
•
Filing: 1955-03-17
•
Granted: 1958-09-30
•
Expires: 1975-03-17
Abstract
No abstract record available.
Inventors
- 👤 Rosswell W Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:56
CPC Classifications
B; B01; B01D; B01D9/00; B01D9/0004; B01D9/0013; A; A23; A23L; A23L2/00; A23L2/02; A23L2/08; A23L2/12; B01D9/004; B01D9/005; B01D9/0063; C; C07; C07C; C07C7/00; C07C7/14; Y; Y10; Y10S; Y10S585/00; Y10S585/949; Y10S585/953
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
IN A PROCESS IN WHICH A CONFINED MASS OF CRYSTALS AND ADHERING MOTHER LIQUOR ARE PASSED THROUGH A LIQUID REMOVAL ZONE, FROM WHICH MOTHER LIQUOR IS REMOVED A REFLUX ZONE AND A MELT ZONE, KN WHICH SAID CRYSTALS ARE MELTED, PART OF THE MELT BEING WITHDRAWN FROM THE SYSTEM AND THE REMAINDER BEING FORCED COUNTERCURRENTLY INTO SAID REFLUX ZONE TO ESTABLISH A REFLUX STREAM WHICH FLOWS FROM SAID MELT ZONE TO SAID LIQUID REMOVAL ZONE, THE IMPROVEMENT WHICH COMPRISES FORCING SAID REFLUX INTO SAID REFLUX ZONE IN THE FORM OF A PULSATING STREAM BY DIRECTLY APPLYING A PULSATING PRESSURE SUBSTANTIALLY ONLY AGAINST SAID MELT, THE PULSATION OF SAID STREAM OCCURRING DURING SUSTAINED APPLICATION OF FORCE TO SAID CRYSTALS TO FEED SAME INTO SAID LIQUID REMOVAL ZONE.
Claim 2
Dependent Claim
126 words
IN A PROCESS IN WHICH A CONFINED MASS OF CRYSTALS AND ADHERING MOTHER LIQUOR ARE PASSED THROUGH A LIQUID REMOVAL ZONE, FROM WHICH MOTHER LIQUOR IS REMOVED A REFLUX ZONE AND A MELT ZONE, KN WHICH SAID CRYSTALS ARE MELTED, PART OF THE MELT BEING WITHDRAWN FROM THE SYSTEM AND THE REMAINDER BEING FORCED COUNTERCURRENTLY INTO SAID REFLUX ZONE TO ESTABLISH A REFLUX STREAM WHICH FLOWS FROM SAID MELT ZONE TO SAID LIQUID REMOVAL ZONE, THE IMPROVEMENT WHICH COMPRISES FORCING SAID REFLUX INTO SAID REFLUX ZONE IN THE FORM OF A PULSATING STREAM BY DIRECTLY APPLYING A PULSATING PRESSURE SUBSTANTIALLY ONLY AGAINST SAID MELT, THE PULSATION OF SAID STREAM OCCURRING DURING SUSTAINED APPLICATION OF FORCE TO SAID CRYSTALS TO FEED SAME INTO SAID LIQUID REMOVAL ZONE.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-29 | 1962-03-31 | 1962-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-29 | 1966-03-31 | 1966-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-29 | 1970-03-31 | 1970-09-30 | $7700.00 | Window Closed / Lapsed |