US2911420A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the separation of difficultly separable mixtures of carboxylic acids
Assignee: Gulf Research and Development Co
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Filing: 1953-08-12
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Granted: 1959-11-03
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Expires: 1973-08-12
Abstract
No abstract record available.
Inventors
- 👤 Jr George P Brown
- 👤 Harry J Elder
- 👤 Norman W Franke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:27
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/42; C07C51/487; C07C51/493
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
143 words
A METHOD FOR SEPARATING A MIXTURE OF CARBOXYLIC ACIDS CONTAINING CONSTITUENTS HAVING DIFFERENT NUMBERS OF CARBOXYL GROUPS PER MOLECULE, COMPRISING FORMING A MIXTURE OF LIKE DERIVATIVES OF SAID ACIDS, SAID DERIVATIVES BEING SELECTED FROM THE GROUP CONSISTING OF ESTERS OF A MONOHYDRIC ALCOHOL AND THIOL ESTERS OF A MONOSULFHYDRIC MERCAPTAN, DISTILLING THE RESULTING MIXTURE OF DERIVATIVES TO OBTAIN AT LEAST ON FRACTION CONTINUING A MIXTURE OF CLOSE-BOILING DERIVATIVES OF ACIDS WHICH HAVE DIFFERENT NUMBERS OF CARBOXYL GROUPS PER MOLECULE, REACTING THE DERIVATIVES IN THIS FRACTION TO FORM A MIXTURE OF LIKE DERIVATIVES SELECTED FROM THE GROUP CONSISTING OF ESTERS AND THIOL ESTERS RESPECTIVELY OF MONOHYDRIC ALCOHOL AND A MONOSULFHYDRIC MERCAPTAN HAVING A DIFFERENT NUMBER OF CARBON ATOMS THAN THAT ORIGINALLY COMBINED IN SAID FRACTION, AND DISTILLING THE RESULTING DERIVATIVE MISTURE TO SEPARATE DERIVATIVES OF ACIDS HAVING DIFFERENT NUMBERS OF CARBOXYL GROUPS PER MOLECULE.
Claim 2
Independent Claim
143 words
A METHOD FOR SEPARATING A MIXTURE OF CARBOXYLIC ACIDS CONTAINING CONSTITUENTS HAVING DIFFERENT NUMBERS OF CARBOXYL GROUPS PER MOLECULE, COMPRISING FORMING A MIXTURE OF LIKE DERIVATIVES OF SAID ACIDS, SAID DERIVATIVES BEING SELECTED FROM THE GROUP CONSISTING OF ESTERS OF A MONOHYDRIC ALCOHOL AND THIOL ESTERS OF A MONOSULFHYDRIC MERCAPTAN, DISTILLING THE RESULTING MIXTURE OF DERIVATIVES TO OBTAIN AT LEAST ON FRACTION CONTINUING A MIXTURE OF CLOSE-BOILING DERIVATIVES OF ACIDS WHICH HAVE DIFFERENT NUMBERS OF CARBOXYL GROUPS PER MOLECULE, REACTING THE DERIVATIVES IN THIS FRACTION TO FORM A MIXTURE OF LIKE DERIVATIVES SELECTED FROM THE GROUP CONSISTING OF ESTERS AND THIOL ESTERS RESPECTIVELY OF MONOHYDRIC ALCOHOL AND A MONOSULFHYDRIC MERCAPTAN HAVING A DIFFERENT NUMBER OF CARBON ATOMS THAN THAT ORIGINALLY COMBINED IN SAID FRACTION, AND DISTILLING THE RESULTING DERIVATIVE MISTURE TO SEPARATE DERIVATIVES OF ACIDS HAVING DIFFERENT NUMBERS OF CARBOXYL GROUPS PER MOLECULE.
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) | 1962-11-02 | 1963-05-04 | 1963-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-02 | 1967-05-04 | 1967-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-02 | 1971-05-04 | 1971-11-03 | $7700.00 | Window Closed / Lapsed |