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Patent US2937160A successfully refreshed from Google Patents.
US2937160A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of polyesters using cobaltous chloride as catalyst
Assignee: Goodyear Tire and Rubber Co
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Filing: 1954-03-26
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Granted: 1960-05-17
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Expires: 1974-03-26
Abstract
No abstract record available.
Inventors
- 👤 John K Sullivan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:38
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/82; C08G63/826
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
54 words
IN A PROCESS FOR PREPARING A POLYESTER BY THE SELFCONDENSATION, WITH THE REMOVAL OF GLYCOL, OF A BIS GLYCOL ESTER OF AT LEAST ONE ACID SELECTED FROM THE GROUP CONSISTING OF TEREPHTHALIC ACID AND ISOPHTHALIC ACID, THE IMPROVEMENT WHICH COMPRISES CARRYING OUT SAID CONDENSATION IN THE PRESENCE OF A CATALYTIC AMOUNT OF COBALTOUS CHLORIDE.
Claim 2
Dependent Claim
54 words
IN A PROCESS FOR PREPARING A POLYESTER BY THE SELFCONDENSATION, WITH THE REMOVAL OF GLYCOL, OF A BIS GLYCOL ESTER OF AT LEAST ONE ACID SELECTED FROM THE GROUP CONSISTING OF TEREPHTHALIC ACID AND ISOPHTHALIC ACID, THE IMPROVEMENT WHICH COMPRISES CARRYING OUT SAID CONDENSATION IN THE PRESENCE OF A CATALYTIC AMOUNT OF COBALTOUS CHLORIDE.
References Cited (Backward Citations)
US2465319A
Cited
US2641591A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-17 | 1963-11-16 | 1964-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-17 | 1967-11-16 | 1968-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-17 | 1971-11-16 | 1972-05-17 | $7700.00 | Window Closed / Lapsed |