US3047539A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of polyesters
Assignee: Goodyear Tire and Rubber Co
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Filing: 1958-11-28
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Granted: 1962-07-31
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Expires: 1978-11-28
Abstract
No abstract record available.
Inventors
- 👤 Brian W Pengilly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:30
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/82; C08G63/85; C08G63/86; C08G63/866
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
IN THE PROCESS FOR PREPARING A LINEAR SUPERPOLYESTER BY SUBJECTING AT LEAST ONE BIS ESTER SELECTED FORM THE GROUP CONSITING OF METHYL, ETHYL, PROPL, BUTYL, AND PHENYL ESTERS OF AN ACID SELECTED FROM TH E GROUP CONSISTING OF TEREPHTHALIC ACID AND ISOPHTHALIC ACID TO ALCOHOLYSIS IN THE PRESENCE OF AN EXCESS OF A GLYCOL SELECTED FROM THE GROUP CONSISTING OF POLYMETHYLENE GLYCOLS CONTAINING FROM 2 TO 4 METHYLENE GROUPS, 1,4-CYCLOHEXANE DIMETHANOL AND 1,4PHENYL DIMETHANOL AND THEREAFTER SUBJECTING THE BIS GLYCOL ESTER THUS FORMED TO SELF CONDENSATION WITH THE REMOVAL OF THE GLYCOL, THE IMPROVEMENT WHICH COMPRISES CARRYING OUT BOTH THE ALCOHOLYSIS AND CONDENSATION IN THE PRESENCE OF A CATALYTIC AMOUNT OF AN ANTIMONY COMPOND OF THE GENERAL FORMULA
Claim 2
Dependent Claim
118 words
IN THE PROCESS FOR PREPARING A LINEAR SUPERPOLYESTER BY SUBJECTING AT LEAST ONE BIS ESTER SELECTED FORM THE GROUP CONSITING OF METHYL, ETHYL, PROPL, BUTYL, AND PHENYL ESTERS OF AN ACID SELECTED FROM TH E GROUP CONSISTING OF TEREPHTHALIC ACID AND ISOPHTHALIC ACID TO ALCOHOLYSIS IN THE PRESENCE OF AN EXCESS OF A GLYCOL SELECTED FROM THE GROUP CONSISTING OF POLYMETHYLENE GLYCOLS CONTAINING FROM 2 TO 4 METHYLENE GROUPS, 1,4-CYCLOHEXANE DIMETHANOL AND 1,4PHENYL DIMETHANOL AND THEREAFTER SUBJECTING THE BIS GLYCOL ESTER THUS FORMED TO SELF CONDENSATION WITH THE REMOVAL OF THE GLYCOL, THE IMPROVEMENT WHICH COMPRISES CARRYING OUT BOTH THE ALCOHOLYSIS AND CONDENSATION IN THE PRESENCE OF A CATALYTIC AMOUNT OF AN ANTIMONY COMPOND OF THE GENERAL FORMULA
References Cited (Backward Citations)
US2739957A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-07-30 | 1966-01-29 | 1966-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-07-30 | 1970-01-29 | 1970-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-07-30 | 1974-01-29 | 1974-07-31 | $7700.00 | Window Closed / Lapsed |