US2689874A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid-liquid solvent extraction
Assignee: Phillips Petroleum Co
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Filing: 1950-09-29
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Granted: 1954-09-21
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Expires: 1970-09-29
Abstract
No abstract record available.
Inventors
- 👤 Robert A Findlay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:10
CPC Classifications
B; B01; B01D; B01D11/00; B01D11/04; B01D11/0426; B01D11/0488
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
IN A CONTINUOUS COUNTERCURRENT LIQUID-LIQUID EXTRACTION SYSTEM, A METHOD OF IMPROVING THE EFFICIENCY OF THE LIQUID-LIQUID EXTRACTION OPERATION COMPRISING MAINTAINING A BODY OF A CONTINUOUS LIQUID PHASE OF EXTRACTANT CONTAINING EXTRACTED CONSTITUENTS IN A LIQUID-LIQUID CONTACTING ZONE, INTRODUCING EXTRACTANT LIQUID INTO SAID CONTINUOUS PHASE IN SAID ZONE AT A POINT NEAR ONE END, REMOVING CONTINUOUS LIQUID PHASE FROM THE OTHER END OF SAID ZONE AS ONE PRODUCT OF THE PROCESS, REMOVING UNEXTRACTED MATERIAL FROM SAID ONE END OF SAID ZONE AS A SECOND PRODUCT OF THE PROCESS, REMOVING CONTINUOUS LIQUID PHASE COMPRISING SOME UNEXTRACTED CONSTITUENTS IN SOLUTION AND CONTAINING SOME UNEXTRACTED CONSTITUENTS AS A DISPERSE LIQUID PHASE FROM SAID ZONE AT A POINT NEAR BUT AT A SPACED DISTANCE FROM SAID OTHER
Claim 2
Dependent Claim
122 words
IN A CONTINUOUS COUNTERCURRENT LIQUID-LIQUID EXTRACTION SYSTEM, A METHOD OF IMPROVING THE EFFICIENCY OF THE LIQUID-LIQUID EXTRACTION OPERATION COMPRISING MAINTAINING A BODY OF A CONTINUOUS LIQUID PHASE OF EXTRACTANT CONTAINING EXTRACTED CONSTITUENTS IN A LIQUID-LIQUID CONTACTING ZONE, INTRODUCING EXTRACTANT LIQUID INTO SAID CONTINUOUS PHASE IN SAID ZONE AT A POINT NEAR ONE END, REMOVING CONTINUOUS LIQUID PHASE FROM THE OTHER END OF SAID ZONE AS ONE PRODUCT OF THE PROCESS, REMOVING UNEXTRACTED MATERIAL FROM SAID ONE END OF SAID ZONE AS A SECOND PRODUCT OF THE PROCESS, REMOVING CONTINUOUS LIQUID PHASE COMPRISING SOME UNEXTRACTED CONSTITUENTS IN SOLUTION AND CONTAINING SOME UNEXTRACTED CONSTITUENTS AS A DISPERSE LIQUID PHASE FROM SAID ZONE AT A POINT NEAR BUT AT A SPACED DISTANCE FROM SAID OTHER
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) | 1957-09-20 | 1958-03-22 | 1958-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-20 | 1962-03-22 | 1962-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-20 | 1966-03-22 | 1966-09-21 | $7700.00 | Window Closed / Lapsed |