US3142733A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of highly polymeric linear polyesters
Assignee: Goodyear Tire and Rubber Co
•
Filing: 1959-06-02
•
Granted: 1964-07-28
•
Expires: 1979-06-02
Abstract
No abstract record available.
Inventors
- 👤 Max H Keck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:52
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/82; C08G63/826; C08G63/85
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
IN A PROCESS FOR PREPARING A HIGHLY POLYMERIC LINEAR POLYESTER BY SUBJECTING AT LEAST ONE BIS ESTER SELECTED FROM THE GROUP CONSISTING OF METHYL, ETHYL, PROPYL, BUTYL AND PHENYL ESTERS OF AN ACID SELECTED FROM THE GROUP CONSISTING OF TEREPHTHALIC ACID AND ISOPHTHALIC ACID TO ALCOHOLYSIS IN THE PRESENCE OF A GLYCOL AND THEREAFTER SUBJECTING THE 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 COMPOUND SELECTED FROM THE GROUP CONSISTING OF TUNGSTIC ACID, TUNGSTEN HEXACHLORIDE, TUNGSTEN CARBONYL, LEAD TUNGSTATE, ZINC TUNGSTATE, IRON TUNGSTATE, ANTIMONY TUNGSTATE, ANTIMONY PARATUNGSTATE, BOROTUNGSTIC ACID AND CADMIUM BOROTUNGSTATE.
Claim 2
Dependent Claim
114 words
IN A PROCESS FOR PREPARING A HIGHLY POLYMERIC LINEAR POLYESTER BY SUBJECTING AT LEAST ONE BIS ESTER SELECTED FROM THE GROUP CONSISTING OF METHYL, ETHYL, PROPYL, BUTYL AND PHENYL ESTERS OF AN ACID SELECTED FROM THE GROUP CONSISTING OF TEREPHTHALIC ACID AND ISOPHTHALIC ACID TO ALCOHOLYSIS IN THE PRESENCE OF A GLYCOL AND THEREAFTER SUBJECTING THE 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 COMPOUND SELECTED FROM THE GROUP CONSISTING OF TUNGSTIC ACID, TUNGSTEN HEXACHLORIDE, TUNGSTEN CARBONYL, LEAD TUNGSTATE, ZINC TUNGSTATE, IRON TUNGSTATE, ANTIMONY TUNGSTATE, ANTIMONY PARATUNGSTATE, BOROTUNGSTIC ACID AND CADMIUM BOROTUNGSTATE.
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) | 1967-07-28 | 1968-01-27 | 1968-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-28 | 1972-01-27 | 1972-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-28 | 1976-01-27 | 1976-07-28 | $7700.00 | Window Closed / Lapsed |