US2939874A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of polyesters
Assignee: American Oil Co
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Filing: 1957-12-30
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Granted: 1960-06-07
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Expires: 1977-12-30
Abstract
No abstract record available.
Inventors
- 👤 Kirkland Earl Vance
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:43
CPC Classifications
C; C11; C11C; C11C3/00; C11C3/003; C07; C07C; C07C51/00; C07C51/42; C07C51/43; C07C51/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
THE METHOD OF PRODUCING SYNTHETIC POLYESTERS HAVING LOW FREE ACID CONTENTS FROM A POLYHYDRIC ALCOHOL AND A MIXTURE OF ACYCLIC MONOCARBOXYLIC ACIDS CONTAINING BOTH STRAIGHT AND BRANCHED CHAIN ACIDS AND HAVING MORE THAN 6 CARBON ATOMS PER MOLECULE, WHICH METHOD COMPRISES (U) DISTILLING THE MIXTURE OF ACIDS INTO A HIGH BOILING PORTION AND A LOW BOILING PORTION, (2) PARTIALLY ESTERIFYING THE POLYHYDRIC ALCOHOL WITH AN AMOUNT OF SAID HIGH BOILING PORTION OF THE ACIDS INSUFFICIENT TO EFFECT COMPLETE ESTERIFICATION OF THE POLYHYDRIC ALCOHOL, (3) ADDING THE LOWER BOILING PORTION OF ACIDS TO THE PARTIALLY ESTERIFIED POLYHYDRIC ALCOHOL IN AN AMOUNT MORE THAN SUFFICIENT TO EFFECT COMPLETE ESTERIFICATION, AND COMPLETING THE ESTERIFICATION OF THE PARTIALLY ESTERIFIED POLYHYDRIC ALCOLHOL, (4) REMOVING UNREACTED LOW BOILING ACIDS FROM THE ESTERIFICATION PRODUCT BY DISTILLATION, (5) AND RECOVERING A PURIFIED LOW FREE ACID CONTENT SYNTHETIC POLYESTER.
Claim 2
Independent Claim
140 words
THE METHOD OF PRODUCING SYNTHETIC POLYESTERS HAVING LOW FREE ACID CONTENTS FROM A POLYHYDRIC ALCOHOL AND A MIXTURE OF ACYCLIC MONOCARBOXYLIC ACIDS CONTAINING BOTH STRAIGHT AND BRANCHED CHAIN ACIDS AND HAVING MORE THAN 6 CARBON ATOMS PER MOLECULE, WHICH METHOD COMPRISES (U) DISTILLING THE MIXTURE OF ACIDS INTO A HIGH BOILING PORTION AND A LOW BOILING PORTION, (2) PARTIALLY ESTERIFYING THE POLYHYDRIC ALCOHOL WITH AN AMOUNT OF SAID HIGH BOILING PORTION OF THE ACIDS INSUFFICIENT TO EFFECT COMPLETE ESTERIFICATION OF THE POLYHYDRIC ALCOHOL, (3) ADDING THE LOWER BOILING PORTION OF ACIDS TO THE PARTIALLY ESTERIFIED POLYHYDRIC ALCOHOL IN AN AMOUNT MORE THAN SUFFICIENT TO EFFECT COMPLETE ESTERIFICATION, AND COMPLETING THE ESTERIFICATION OF THE PARTIALLY ESTERIFIED POLYHYDRIC ALCOLHOL, (4) REMOVING UNREACTED LOW BOILING ACIDS FROM THE ESTERIFICATION PRODUCT BY DISTILLATION, (5) AND RECOVERING A PURIFIED LOW FREE ACID CONTENT SYNTHETIC POLYESTER.
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) | 1963-06-07 | 1963-12-07 | 1964-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-07 | 1967-12-07 | 1968-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-07 | 1971-12-07 | 1972-06-07 | $7700.00 | Window Closed / Lapsed |