US3268482A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of polyesters
Assignee: Goodyear Tire and Rubber Co
•
Filing: 1962-09-27
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Granted: 1966-08-23
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Expires: 1982-09-27
Abstract
No abstract record available.
Inventors
- 👤 Piirma Aleksander
- 👤 Maria V Wiener
- 👤 Warren K Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:59
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C07; C07C; C07C67/00; C07C67/48; C07C67/62
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
71 words
A METHOD OF STABILIZING AN ESTER OF AN ACID SELECTED FROM THE GROUP CONSISTING OF TEREPHTHALIC ACID AND ISOPHTHALIC ACID AGAINST HYDROLYSIS WHICH COMPRISES ADDING TO THE ESTER IN MOLTEN STATE FROM 1 TO 5 MOLS PER MOL OF WATER IN SAID ESTER OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF ACETALS, ORGANIC ORTHO ESTERS, OGANIC ARBONATE ESTER AND CYCLIC ESTERS CONTAINING FROM 3 TO 4 ATOMS IN THE RING.
Claim 2
Independent Claim
71 words
A METHOD OF STABILIZING AN ESTER OF AN ACID SELECTED FROM THE GROUP CONSISTING OF TEREPHTHALIC ACID AND ISOPHTHALIC ACID AGAINST HYDROLYSIS WHICH COMPRISES ADDING TO THE ESTER IN MOLTEN STATE FROM 1 TO 5 MOLS PER MOL OF WATER IN SAID ESTER OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF ACETALS, ORGANIC ORTHO ESTERS, OGANIC ARBONATE ESTER AND CYCLIC ESTERS CONTAINING FROM 3 TO 4 ATOMS IN THE RING.
Claim 3
Dependent Claim
116 words
IN A PROCESS FOR PREPARING A HIGH MOLECULAR WEIGHT POLYMER POLYESTER BY SUBJECTING AT LEAST ONE OF BIS ESTER OF AN ACID SELECTED FROM THE GROUP CONSISTING OF TEREPHTHALIC ACID AND ISOPHTHALIC ACID TO ALCOHOLYSIS IN THE PRESENCE OF AN EXCESS OF GLYCOL AND THEREAFTER SUBJECTING THE GYCOL ESTERS FORMED TO CONDENSTATION WITH THE REMOVAL OF GLYCOL, THE IMPROVEMENT WHICH COMPRISES ADDING AN AMOUNT SUFFICIENT TO EACT WITH THE WATER IN SAID ESTER OF A COMPOUND SELECED FROM THE GROUP CONSISTING OF ACETALS, ORGANIC ORTHO ESTERS, ORGANIC CARBONATE ESTERS, AND CYCLIC ESTERS CONTAINING FROM 3 TO 4 ATOMS IN HE RING TO SAID BIS ESTER AND THEREAFTER SUBJECTING THE MIXTURE TO THE ALCOHOLYSIS AND CONDENSATION REACTIONS.
Claim 4
Dependent Claim
116 words
IN A PROCESS FOR PREPARING A HIGH MOLECULAR WEIGHT POLYMER POLYESTER BY SUBJECTING AT LEAST ONE OF BIS ESTER OF AN ACID SELECTED FROM THE GROUP CONSISTING OF TEREPHTHALIC ACID AND ISOPHTHALIC ACID TO ALCOHOLYSIS IN THE PRESENCE OF AN EXCESS OF GLYCOL AND THEREAFTER SUBJECTING THE GYCOL ESTERS FORMED TO CONDENSTATION WITH THE REMOVAL OF GLYCOL, THE IMPROVEMENT WHICH COMPRISES ADDING AN AMOUNT SUFFICIENT TO EACT WITH THE WATER IN SAID ESTER OF A COMPOUND SELECED FROM THE GROUP CONSISTING OF ACETALS, ORGANIC ORTHO ESTERS, ORGANIC CARBONATE ESTERS, AND CYCLIC ESTERS CONTAINING FROM 3 TO 4 ATOMS IN HE RING TO SAID BIS ESTER AND THEREAFTER SUBJECTING THE MIXTURE TO THE ALCOHOLYSIS AND CONDENSATION REACTIONS.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-08-22 | 1970-02-21 | 1970-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-22 | 1974-02-21 | 1974-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-22 | 1978-02-21 | 1978-08-23 | $7700.00 | Window Closed / Lapsed |