US2744089A
Expired / Lapsed
US
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Linear highly polymeric polyesters from p, p'-sulfonyl dibenzoic acid and pentamethylene or higher glycols
Assignee: Eastman Kodak Co
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Filing: 1952-10-03
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Granted: 1956-05-01
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Expires: 1972-10-03
Abstract
No abstract record available.
Inventors
- 👤 John R Caldwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:09
CPC Classifications
C; C07; C07C; C07C315/00; C07C315/04; C08; C08G; C08G63/00; C08G63/68; C08G63/688; C08G63/6884; C08G63/6886; C08G63/78; C08G63/82
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
17 words
A PROCESS FOR PREPARING A LINEAR POLYESTER COMPRISING (A) CONDENSING A P,P''-SULFONYL DIBENZOIC COMPOUND HAVING THE FORMULA:
Claim 2
Dependent Claim
17 words
A PROCESS FOR PREPARING A LINEAR POLYESTER COMPRISING (A) CONDENSING A P,P''-SULFONYL DIBENZOIC COMPOUND HAVING THE FORMULA:
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) | 1959-05-01 | 1959-10-31 | 1960-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-01 | 1963-10-31 | 1964-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-01 | 1967-10-31 | 1968-05-01 | $7700.00 | Window Closed / Lapsed |