US2935525A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Esterification of organic acids
Assignee: Abbott Laboratories
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Filing: 1956-08-13
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Granted: 1960-05-03
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Expires: 1976-08-13
Abstract
No abstract record available.
Inventors
- 👤 Allen G Debus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:28
CPC Classifications
C; C07; C07C; C07C205/00; C07C205/49; C07C205/57; C07C227/00; C07C227/14; C07C227/18; C07C231/00; C07C231/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
110 words
IN THE METHOD OF MAKING AN AMINO ESTER WHICH COMPRISES FORMING A REACTION MIXTURE WITH A DI-LOWER ALKYLAMINO ALCOHOL SELECTED FROM THE GROUP CONSISTING OF DIETHYLAMINOETHANOL, DIBUTYLAMINOPROPANOL, DIMETHYLAMINOETHANOL, AMYLAMINOETHANOL AND 2-ISOBUTYLAMINOETHANOL AND AN ORGANIC ACID SELECTED FROM THE GROUP CONSISTING OF BENZOIC ACID AND NITROBENZOIC ACID THE IMPROVEMENT WHICH COMPRISES: FORMING SAID MIXTURE IN AN INERT ORGANIC SOLVENT SUBSTANTIALLY IMMISCIBLE WITH WATER AND HAVING A BOILING POINT BETWEEN 120-180*C. AT A CONCENTRATION OF ABOUT ONE-HALF MOLE OF EACH REACTANT IN ABOUT ONE LITER OF SAID SOLVENT, HEATING SAID REACTION MIXTURE WITHOUT THE PRESENCE OF A CATALYST BETWEEN 120-180* C. WHILE REMOVING THE WATER FORMED IN THE REACTION BY AZEOTROPIC DISTILLATION.
Claim 2
Dependent Claim
110 words
IN THE METHOD OF MAKING AN AMINO ESTER WHICH COMPRISES FORMING A REACTION MIXTURE WITH A DI-LOWER ALKYLAMINO ALCOHOL SELECTED FROM THE GROUP CONSISTING OF DIETHYLAMINOETHANOL, DIBUTYLAMINOPROPANOL, DIMETHYLAMINOETHANOL, AMYLAMINOETHANOL AND 2-ISOBUTYLAMINOETHANOL AND AN ORGANIC ACID SELECTED FROM THE GROUP CONSISTING OF BENZOIC ACID AND NITROBENZOIC ACID THE IMPROVEMENT WHICH COMPRISES: FORMING SAID MIXTURE IN AN INERT ORGANIC SOLVENT SUBSTANTIALLY IMMISCIBLE WITH WATER AND HAVING A BOILING POINT BETWEEN 120-180*C. AT A CONCENTRATION OF ABOUT ONE-HALF MOLE OF EACH REACTANT IN ABOUT ONE LITER OF SAID SOLVENT, HEATING SAID REACTION MIXTURE WITHOUT THE PRESENCE OF A CATALYST BETWEEN 120-180* C. WHILE REMOVING THE WATER FORMED IN THE REACTION BY AZEOTROPIC DISTILLATION.
Claim 3
Dependent Claim
79 words
IN A METHOD OF MAKING AN AMINO ESTER WHICH COMPRISES FORMING A REACTION MIXTURE OF P-NITROBENZOIC ACID AND DIETHYLAMIOETHANOL THE IMPROVEMENT WHICH COMPRISES: FORMING SAID MIXTURE IN ZYLENE AT A CONCENTRATION OF ABOUT ONE-HALF MOLE OF EACH REACTANT IN ABOUT ONE LITER OF SAID XYLENE, HEATING SAID REACTION MIXTURE WITHOUT THE PRESENCE OF A CATALYST TO A REACTION TEMPERATURE OF 135-140*C. WHILE CONTINUOUSLY REMOVING THE WATER FORMED IN THE REACTION BY AZEOTROPIC DISTILLATION AND, THEREAFTER, RECOVERING THE SAID ESTER.
Claim 4
Dependent Claim
79 words
IN A METHOD OF MAKING AN AMINO ESTER WHICH COMPRISES FORMING A REACTION MIXTURE OF P-NITROBENZOIC ACID AND DIETHYLAMIOETHANOL THE IMPROVEMENT WHICH COMPRISES: FORMING SAID MIXTURE IN ZYLENE AT A CONCENTRATION OF ABOUT ONE-HALF MOLE OF EACH REACTANT IN ABOUT ONE LITER OF SAID XYLENE, HEATING SAID REACTION MIXTURE WITHOUT THE PRESENCE OF A CATALYST TO A REACTION TEMPERATURE OF 135-140*C. WHILE CONTINUOUSLY REMOVING THE WATER FORMED IN THE REACTION BY AZEOTROPIC DISTILLATION AND, THEREAFTER, RECOVERING THE SAID ESTER.
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) | 1963-05-03 | 1963-11-02 | 1964-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-03 | 1967-11-02 | 1968-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-03 | 1971-11-02 | 1972-05-03 | $7700.00 | Window Closed / Lapsed |