US2895835A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation by crystallization
Assignee: Phillips Petroleum Co
•
Filing: 1954-06-28
•
Granted: 1959-07-21
•
Expires: 1974-06-28
Abstract
No abstract record available.
Inventors
- 👤 Robert A Findlay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:51
CPC Classifications
C; C30; C30B; C30B13/00; C30B13/005; B; B01; B01D; B01D9/00; B01D9/0004; B01D9/0013; B01D9/004; B01D9/005; B01D9/0059; C07; C07C; C07C51/00; C07C51/42; C07C51/43; C07C7/00; C07C7/14; Y; Y10; Y10S; Y10S585/00; Y10S585/919; Y10S585/921
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
A PROCESS FOR PURIFYING AN IMPURE CRYSTALLINE MATERIAL, WHICH COMPRISES INTERMITTENTLY MOVING AN ELONGATED COMPACT MASS OF IMPURE CRYSTALS THROUGH AN ELONGATED CONFINED DISPLACEMENT ZONE TOWARD A MELTING ZONE AT ONE END THEREOF BY THE RECIPROCATING MOVEMENT OF A PISTON SPACED UPSTREAM FROM SAID MELTING ZONE; MELTING CRYSTALS IN SAID MELTING ZONE; DISPLACING A PORTION OF RESULTING MELT COUNTERCURRENTLY THROUGH AT LEAST A PORTION OF SAID COMPACT MASS OF IMPURE CRYSTALS SO AS TO DISPLACE LIQUID THEREFROM; REMOVING DISPLACED LIQUID FROM AN UPSTREAM PORTION OF SAID DISPLACEMENT ZONE THROUGH FILTER MEANS; MAINTAINING A BACK PRESSURE ON SAID DISPLACED LIQUID SO REMOVED SO AS TO CAUSE A BACK FLOW OF SAID DISPLACED LIQUID THROUGH SAID FILTER MEANS UPON THE BACK STROKE OF SAID PISTON SO AS TO DISLODGE ANY CRYSTALLINE MATERIAL FROM SAID FILTER MEANS; AND REMOVING PURIFIED PRODUCT FROM SAID MELT ZONE.
Claim 2
Dependent Claim
142 words
A PROCESS FOR PURIFYING AN IMPURE CRYSTALLINE MATERIAL, WHICH COMPRISES INTERMITTENTLY MOVING AN ELONGATED COMPACT MASS OF IMPURE CRYSTALS THROUGH AN ELONGATED CONFINED DISPLACEMENT ZONE TOWARD A MELTING ZONE AT ONE END THEREOF BY THE RECIPROCATING MOVEMENT OF A PISTON SPACED UPSTREAM FROM SAID MELTING ZONE; MELTING CRYSTALS IN SAID MELTING ZONE; DISPLACING A PORTION OF RESULTING MELT COUNTERCURRENTLY THROUGH AT LEAST A PORTION OF SAID COMPACT MASS OF IMPURE CRYSTALS SO AS TO DISPLACE LIQUID THEREFROM; REMOVING DISPLACED LIQUID FROM AN UPSTREAM PORTION OF SAID DISPLACEMENT ZONE THROUGH FILTER MEANS; MAINTAINING A BACK PRESSURE ON SAID DISPLACED LIQUID SO REMOVED SO AS TO CAUSE A BACK FLOW OF SAID DISPLACED LIQUID THROUGH SAID FILTER MEANS UPON THE BACK STROKE OF SAID PISTON SO AS TO DISLODGE ANY CRYSTALLINE MATERIAL FROM SAID FILTER MEANS; AND REMOVING PURIFIED PRODUCT FROM SAID MELT ZONE.
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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) | 1962-07-20 | 1963-01-19 | 1963-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-07-20 | 1967-01-19 | 1967-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-07-20 | 1971-01-19 | 1971-07-21 | $7700.00 | Window Closed / Lapsed |