US2728745A
Expired / Lapsed
US
⏱️ 0.0 years remaining
N-(p-cinnamoylphenyl) urethanes of hydroxyl-containing polymers
Assignee: Eastman Kodak Co
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Filing: 1954-03-23
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Granted: 1955-12-27
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Expires: 1974-03-23
Abstract
No abstract record available.
Inventors
- 👤 Jr Albert C Smith
- 👤 Cornelius C Unruh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:51
CPC Classifications
C; C08; C08F; C08F8/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
85 words
A PROCESS FOR PREPARING AN N-(P-CINNAMOYLPHENYL)URETHANE OF A HYDROXYL-CONTAINING POLYMER SELECTED FROM THE GROUP CONSISTING OF POLYVINYL ALCOHOL, A POLYVINYL ACETAL CONTAINING FREE HYDROXYL GROUPS, A POLYVINYL BUTYRAL CONTAINING FREE HYDROXYL GROUPS, A CELLULOSE ETHYL ETHER CONTAINING FREE HYDROXYL GROUPS AND A CELLULOSE CARBOXYLIC ESTER CONTAINING FREE HYDROXYL GROUPS WHICH COMPRISES REACTING THE SAID POLYMER WITH P-ISOCYANOACETOPHENONE TO GIVE THE INTERMEDIATE P-ACETOPHENYLURETHAN DERIVATIVE OF THE POLYMER, AND THEN REACTING THE SAID INTERMEDIATE WITH AN AROMATIC ALDEHYDE SELECTED FROM THOSE REPRESENTED BY THE FOLLOWING GENERAL FORMULA:
Claim 2
Dependent Claim
85 words
A PROCESS FOR PREPARING AN N-(P-CINNAMOYLPHENYL)URETHANE OF A HYDROXYL-CONTAINING POLYMER SELECTED FROM THE GROUP CONSISTING OF POLYVINYL ALCOHOL, A POLYVINYL ACETAL CONTAINING FREE HYDROXYL GROUPS, A POLYVINYL BUTYRAL CONTAINING FREE HYDROXYL GROUPS, A CELLULOSE ETHYL ETHER CONTAINING FREE HYDROXYL GROUPS AND A CELLULOSE CARBOXYLIC ESTER CONTAINING FREE HYDROXYL GROUPS WHICH COMPRISES REACTING THE SAID POLYMER WITH P-ISOCYANOACETOPHENONE TO GIVE THE INTERMEDIATE P-ACETOPHENYLURETHAN DERIVATIVE OF THE POLYMER, AND THEN REACTING THE SAID INTERMEDIATE WITH AN AROMATIC ALDEHYDE SELECTED FROM THOSE REPRESENTED BY THE FOLLOWING GENERAL FORMULA:
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-12-26 | 1959-06-27 | 1959-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-26 | 1963-06-27 | 1963-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-26 | 1967-06-27 | 1967-12-27 | $7700.00 | Window Closed / Lapsed |