US2796413A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modification of partially hydrolyzed polyvinyl ester with a dicarboxylic acid anhydride
Assignee: Monsanto Chemicals Ltd
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Filing: 1954-10-15
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Granted: 1957-06-18
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Expires: 1974-10-15
Abstract
No abstract record available.
Inventors
- 👤 Baer Massimo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:04
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08F; C08F8/00; C08F8/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
49 words
A PROCESS FOR PREPARING A POLYMERIC MATERIAL WHICH COMPRISES DISSOLVING A PARTIALLY HYDROLYZED POLYVINYL ESTER IN DIMETHYL FORMAMIDE, ADDING AN ANHYDRIDE OF A DICARBOXYLIC ACID TO THE SOLUTION, AND HEATING THE SOLUTION AT FROM 70 TO 85*C. AT ATMOSPHERIC PRESSURE, SAID PROCESS BEING CARRIED OUT UNDER SUBSTANTIALLY AHYDROUS CONDITIONS
Claim 2
Dependent Claim
49 words
A PROCESS FOR PREPARING A POLYMERIC MATERIAL WHICH COMPRISES DISSOLVING A PARTIALLY HYDROLYZED POLYVINYL ESTER IN DIMETHYL FORMAMIDE, ADDING AN ANHYDRIDE OF A DICARBOXYLIC ACID TO THE SOLUTION, AND HEATING THE SOLUTION AT FROM 70 TO 85*C. AT ATMOSPHERIC PRESSURE, SAID PROCESS BEING CARRIED OUT UNDER SUBSTANTIALLY AHYDROUS CONDITIONS
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) | 1960-06-17 | 1960-12-17 | 1961-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-06-17 | 1964-12-17 | 1965-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-06-17 | 1968-12-17 | 1969-06-18 | $7700.00 | Window Closed / Lapsed |