US2563739A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solvent extraction of organic acids
Assignee: Cities Service Oil Co
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Filing: 1948-09-04
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Granted: 1951-08-07
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Expires: 1968-09-04
Abstract
No abstract record available.
Inventors
- 👤 Palm John William
- 👤 Jack A King
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:22
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/42; C07C51/48
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
THE METHOD OF RECOVERING ORGANIC ACIDS FROM AQUEOUS SOLUTIONS INCLUDING INTRODUCING AN AQUEOUS SOLUTION OF LOWER ALIPHATIC ACIDS DERIVED FROM A FISCHER-TROPSCH SYNTHESIS CONTAINING LESS THAN ABOUT FIVE PER CENT ACIDS TO THE TOP OF AN EXTRACTION TOWER, INTRODUCING ISOPROPYL ETHER TO THE BOTTOM OF THE EXTRACTION TOWER, INTRODUCING METHYL ETHYL KETONE TO THE EXTRACTION TOWER AT A POINT ABOVE THE INTRODUCTION POINT OF THE ISOPROPYL EHTER, PASSING THE AQUEOUS SOLUTION THROUGH THE EXTRACTION TOWER IN COUNTERCURRENT TO THE ISOPROPYL ETHER AND METHYL ETHYL KETONE, RECOVERING AN EXTRACT CONTAINING ALIPHATIC ACIDS FROM THE TOP OF THE EXTRACTION COLUMN AND RECOVERING AN AQUEOUS SOLUTION OF ALIPHATIC ACIDS SUBSTANTIALLY WEAKER THAN THE ORIGINAL ALIPHATIC ACID SOLUTION FROM THE BOTTOM OF THE TOWER.
Claim 2
Independent Claim
120 words
THE METHOD OF RECOVERING ORGANIC ACIDS FROM AQUEOUS SOLUTIONS INCLUDING INTRODUCING AN AQUEOUS SOLUTION OF LOWER ALIPHATIC ACIDS DERIVED FROM A FISCHER-TROPSCH SYNTHESIS CONTAINING LESS THAN ABOUT FIVE PER CENT ACIDS TO THE TOP OF AN EXTRACTION TOWER, INTRODUCING ISOPROPYL ETHER TO THE BOTTOM OF THE EXTRACTION TOWER, INTRODUCING METHYL ETHYL KETONE TO THE EXTRACTION TOWER AT A POINT ABOVE THE INTRODUCTION POINT OF THE ISOPROPYL EHTER, PASSING THE AQUEOUS SOLUTION THROUGH THE EXTRACTION TOWER IN COUNTERCURRENT TO THE ISOPROPYL ETHER AND METHYL ETHYL KETONE, RECOVERING AN EXTRACT CONTAINING ALIPHATIC ACIDS FROM THE TOP OF THE EXTRACTION COLUMN AND RECOVERING AN AQUEOUS SOLUTION OF ALIPHATIC ACIDS SUBSTANTIALLY WEAKER THAN THE ORIGINAL ALIPHATIC ACID SOLUTION FROM THE BOTTOM OF THE TOWER.
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) | 1954-08-06 | 1955-02-05 | 1955-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-08-06 | 1959-02-05 | 1959-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-08-06 | 1963-02-05 | 1963-08-07 | $7700.00 | Window Closed / Lapsed |