US2759909A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing polyvinyl dicarboxylic acid esters
Assignee: Eastman Kodak Co
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Filing: 1952-06-18
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Granted: 1956-08-21
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Expires: 1972-06-18
Abstract
No abstract record available.
Inventors
- 👤 Gordon D Hiatt
- 👤 Emerson John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:22
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/14
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
75 words
A PROCESS FOR PREPARING POLYVINYL DICARBOXYLIC ACID ESTERS WHICH COMPRISES REACTING UPON A HYDROLZYED POLYVINYL ORGANIC ACID ESTER WITH AN ANHYDROUS BATH COMPRISING AN ANHYDRIDE OF A MATERIAL CONSISTING OF A DICARBOXYLIC ACID, A LOWER FATTY ACID AS THE DILUENT AND AS THE CATALYST AN ACID SOLUBLE SALT HAVING BASIC PROPERTIES IN ALIPHATIC ACID SOLUTION SELECTED FROM THE GROUP CONSISTING OF THE ALKALI METAL, ALKALINE EARTH METAL SALTS AND THE AMINE SALTS OF ACETIC ACID.
References Cited (Backward Citations)
US2358387A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-08-21 | 1960-02-20 | 1960-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-08-21 | 1964-02-20 | 1964-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-08-21 | 1968-02-20 | 1968-08-21 | $7700.00 | Window Closed / Lapsed |