US2823197A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyesters and their preparation
Assignee: Shell Development Co
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Filing: 1954-07-01
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Granted: 1958-02-11
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Expires: 1974-07-01
Abstract
No abstract record available.
Inventors
- 👤 Rupert C Morris
- 👤 Vernon W Buls
- 👤 George W Conklin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:27
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/68; C08G63/688; C08G63/02; C08G63/12; C08G63/46; C08G63/48; C08G63/66
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
49 words
A RESINOUS POLYESTER OF A POLYCARBOXYLIC ACID HAVING A LINEAR CHAIN CONTAINING AT LEAST THREE-SIX-MEMBERED CARBOCYCLIC RINGS WHICH ARE JOINED TOGETHER IN SERIES BY BIVALENT ALIPHATIC HYDROCARBON RADICALS WHICH CONTAIN ONLY CARBON-TO-CARBON LINKAGES AND HAVING AT LEAST TWO CARBOXYL GROUPS ATTACHED TO SEPARATE CARBOXYLIC RINGS, AND A POLYHYDRIC ALCOHOL.
Claim 2
Dependent Claim
49 words
A RESINOUS POLYESTER OF A POLYCARBOXYLIC ACID HAVING A LINEAR CHAIN CONTAINING AT LEAST THREE-SIX-MEMBERED CARBOCYCLIC RINGS WHICH ARE JOINED TOGETHER IN SERIES BY BIVALENT ALIPHATIC HYDROCARBON RADICALS WHICH CONTAIN ONLY CARBON-TO-CARBON LINKAGES AND HAVING AT LEAST TWO CARBOXYL GROUPS ATTACHED TO SEPARATE CARBOXYLIC RINGS, AND A POLYHYDRIC ALCOHOL.
References Cited (Backward Citations)
GB604074A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-02-10 | 1961-08-12 | 1962-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-10 | 1965-08-12 | 1966-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-10 | 1969-08-12 | 1970-02-11 | $7700.00 | Window Closed / Lapsed |