US2828289A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyvinyl acetal acid dicarboxylates and their preparation
Assignee: Eastman Kodak Co
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Filing: 1955-03-09
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Granted: 1958-03-25
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Expires: 1975-03-09
Abstract
No abstract record available.
Inventors
- 👤 John W Mench
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:09
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
A METHOD OF MAKING POLYVINYL ACETAL DICARBOXYLATES WHICH COMPRISES REACTING UPON POLYVINYL ACETATE, WHICH HAS BEEN 50-100% HYDROLYZED, WITH AN ALDEHYDE IN THE PRESENCE OF .001-5 PART OF MINERAL ACID CATALYST PER PART OF POLYVINYL COMPOUND, ADDING TO THE MASS WITHOUT PRECIPITATING THE PRODUCT THEREFROM AN ALKALI METAL ACETATE IN SUFFICIENT AMOUNT TO NEUTRALIZE THE MINERAL ACID AND TO PROVIDE AN EXCESS OF THE ALKALI METAL ACETATE IN AN AMOUNT 5-500% OF THE POLYVINYL COMPOUND PRESENT TOGETHER WITH A DICARBOXYLIC ACID ANHYDRIDE AND REACTING THE MASS UNTIL A SUBSTANTIAL DICARBOXYL CONTENT IS IMPARTED TO THE POLYVINYL COMPOND THEREIN.
Claim 2
Independent Claim
98 words
A METHOD OF MAKING POLYVINYL ACETAL DICARBOXYLATES WHICH COMPRISES REACTING UPON POLYVINYL ACETATE, WHICH HAS BEEN 50-100% HYDROLYZED, WITH AN ALDEHYDE IN THE PRESENCE OF .001-5 PART OF MINERAL ACID CATALYST PER PART OF POLYVINYL COMPOUND, ADDING TO THE MASS WITHOUT PRECIPITATING THE PRODUCT THEREFROM AN ALKALI METAL ACETATE IN SUFFICIENT AMOUNT TO NEUTRALIZE THE MINERAL ACID AND TO PROVIDE AN EXCESS OF THE ALKALI METAL ACETATE IN AN AMOUNT 5-500% OF THE POLYVINYL COMPOUND PRESENT TOGETHER WITH A DICARBOXYLIC ACID ANHYDRIDE AND REACTING THE MASS UNTIL A SUBSTANTIAL DICARBOXYL CONTENT IS IMPARTED TO THE POLYVINYL COMPOND THEREIN.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-24 | 1961-09-23 | 1962-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-24 | 1965-09-23 | 1966-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-24 | 1969-09-23 | 1970-03-25 | $7700.00 | Window Closed / Lapsed |