US2581832A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heterogeneous, basic hydrolysis of carboxylic acid esters of polyvinyl alcohol with quaternary ammonium bases
Assignee: EIDP Inc
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Filing: 1947-09-05
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Granted: 1952-01-08
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Expires: 1967-09-05
Abstract
No abstract record available.
Inventors
- 👤 Roe C Blume
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:27
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
A PROCESS FOR HETEROGENEOUSLY HTDROLYZING A WATER-INSOLUBLE POLYVINYL ESTER COMPRISING A CARBOXYLIC ACID ESTER OF POLYVINYL ALCOHOL WHICH COMPRISES FORMING A MIXTURE OF WATER AND A QUATERNARY AMMONIUM BASE HAVING AT LEAST ONE ALKYL CHAIN AT LEAST FOUR CARBON ATOMS IN LENGTH, SAID QUATERNARY AMMONIUM BASE BEING APPRECIABLY SOLUBLE IN SAID ESTER IN THE PRESENCE OF WATER; ADDING TO THE RESULTANT HYDROLYZING MEDIUM SAID WATER-INSOLUBLE POLYVINYL ESTER, THEREBY FORMING A HETEROGENEOUS MIXTURE WHICH HAS AN INITIAL PH OF AT LEAST 10 AND SURFACE TENSION OF LESS THAN 50 DYNES PER CENTIMETER AND THEREBY DISSOLVING AT LEAST A PORTION OF SAID QUATERNARY AMMONIUM BASE IN SAID POLYVINYL ESTER AND THEN HYDROLYZING SAID ESTER BY HEATING SAID HETEROGENEOUS MIXTURE.
Claim 2
Dependent Claim
117 words
A PROCESS FOR HETEROGENEOUSLY HTDROLYZING A WATER-INSOLUBLE POLYVINYL ESTER COMPRISING A CARBOXYLIC ACID ESTER OF POLYVINYL ALCOHOL WHICH COMPRISES FORMING A MIXTURE OF WATER AND A QUATERNARY AMMONIUM BASE HAVING AT LEAST ONE ALKYL CHAIN AT LEAST FOUR CARBON ATOMS IN LENGTH, SAID QUATERNARY AMMONIUM BASE BEING APPRECIABLY SOLUBLE IN SAID ESTER IN THE PRESENCE OF WATER; ADDING TO THE RESULTANT HYDROLYZING MEDIUM SAID WATER-INSOLUBLE POLYVINYL ESTER, THEREBY FORMING A HETEROGENEOUS MIXTURE WHICH HAS AN INITIAL PH OF AT LEAST 10 AND SURFACE TENSION OF LESS THAN 50 DYNES PER CENTIMETER AND THEREBY DISSOLVING AT LEAST A PORTION OF SAID QUATERNARY AMMONIUM BASE IN SAID POLYVINYL ESTER AND THEN HYDROLYZING SAID ESTER BY HEATING SAID HETEROGENEOUS MIXTURE.
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) | 1955-01-07 | 1955-07-09 | 1956-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-01-07 | 1959-07-09 | 1960-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-01-07 | 1963-07-09 | 1964-01-08 | $7700.00 | Window Closed / Lapsed |