US3386960A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of preparing polyesters in the presence of a catalytic amount of a praseodymium compound
Assignee: Goodyear Tire and Rubber Co
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Filing: 1963-01-10
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Granted: 1968-06-04
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Expires: 1983-01-10
Abstract
No abstract record available.
Inventors
- 👤 Maria V Wiener
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:37
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/82; C08G63/84
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
IN A PROCESS FOR PREPARING A POLYMERIC LINEAR POLYESTER BY SUBJECTING AT LEAST ONE BIS ESTER OF A DICARBOXYLIC ACID TO ALCOHOLYSIS IN THE PRESENCE OF AN EXCESS OF A GLYCOL AND THEREAFTER SUBJECTING THE BIS GLYCOL ESTER FORMED TO SELF-CONDENSATION WITH THE REMOVAL OF GLYCOL, THE IMPROVEMENT WHICH COMPRISES CARRYING OUT BOTH THE ALCOHOLYSIS AND CONDENSATION IN THE PRESENCE OF A CATALYTIC AMOUNT OF A PRASEODYMIUM COMPOUND SELECTED FROM THE GROUP CONSISTING OF PRASEODYMIUM METAL, PRASEODYMIUM OXIDE, PRASEODYMIUM ALCOHOLATE, PRASEODYMIUM GLYCOLATE, PRASEODYMIUM ACETATE, PRASEODYMIUM FORMATE, PRASEODYMIUM OXALATE AND PRASEODYMIUM CHLORIDE.
Claim 2
Dependent Claim
91 words
IN A PROCESS FOR PREPARING A POLYMERIC LINEAR POLYESTER BY SUBJECTING AT LEAST ONE BIS ESTER OF A DICARBOXYLIC ACID TO ALCOHOLYSIS IN THE PRESENCE OF AN EXCESS OF A GLYCOL AND THEREAFTER SUBJECTING THE BIS GLYCOL ESTER FORMED TO SELF-CONDENSATION WITH THE REMOVAL OF GLYCOL, THE IMPROVEMENT WHICH COMPRISES CARRYING OUT BOTH THE ALCOHOLYSIS AND CONDENSATION IN THE PRESENCE OF A CATALYTIC AMOUNT OF A PRASEODYMIUM COMPOUND SELECTED FROM THE GROUP CONSISTING OF PRASEODYMIUM METAL, PRASEODYMIUM OXIDE, PRASEODYMIUM ALCOHOLATE, PRASEODYMIUM GLYCOLATE, PRASEODYMIUM ACETATE, PRASEODYMIUM FORMATE, PRASEODYMIUM OXALATE AND PRASEODYMIUM CHLORIDE.
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) | 1971-06-04 | 1971-12-04 | 1972-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-04 | 1975-12-04 | 1976-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-04 | 1979-12-04 | 1980-06-04 | $7700.00 | Window Closed / Lapsed |