US2966479A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing high molecular weight polyesters from monoepoxides
Assignee: Shell USA Inc
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Filing: 1957-09-27
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Granted: 1960-12-27
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Expires: 1977-09-27
Abstract
No abstract record available.
Inventors
- 👤 Rudolph F Fischer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:01
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/52; C08G63/56; C08G63/58; C08G63/40; C08G63/42; C08G63/68; C08G63/682; C08G63/6824
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
30 words
A PROCESS FOR PREPARING LINEAR POLYESTERS HAVING A MOLECULAR WEIGHT ABOVE 8,000 WHICH COMPRISES HEATING AT A TEMPERATURE BETWEEN 70*C. AND 180*C. A DICARBOXYLIC ACID ANHYDRIDE WHICH CONTAINS A CYCLIC
Claim 2
Dependent Claim
30 words
A PROCESS FOR PREPARING LINEAR POLYESTERS HAVING A MOLECULAR WEIGHT ABOVE 8,000 WHICH COMPRISES HEATING AT A TEMPERATURE BETWEEN 70*C. AND 180*C. A DICARBOXYLIC ACID ANHYDRIDE WHICH CONTAINS A CYCLIC
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) | 1963-12-27 | 1964-06-27 | 1964-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-27 | 1968-06-27 | 1968-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-27 | 1972-06-27 | 1972-12-27 | $7700.00 | Window Closed / Lapsed |