US2734048A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chsoh
Assignee: —
•
Filing: —
•
Granted: 1956-02-07
•
Expires: 1973-02-07
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:30
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
A PROCESS WHICH COMPRISES REACTING THE POLYMER IZED VINYL ESTER OF A SATURATED CARBOXYLIC ACID CONTAINING 1 TO 4 CARBON ATOMS WITH A HYDROLYTIC ALCOHOL CONTAINING 1 TO 4 CARBON ATOMS IN THE PRESENCE OF AN ALKALI METAL ALCOHOLATE CATALYST UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS, MAINTAINING SAID ALCOHOLATE CONCENTRATION BETWEEN ABOUT 0.05 TO 5% BY WEIGHT OF THE REACTION MIXTURE, MAINTAINING THE CONCENTRATION OF SAID POLYVINYL ESTER BETWEEN ABOUT 0.1 AND 1% BY WEIGHT OF SAID REACTION MIXTURE, SAID POLYVINYL ESTER PRESENT IN SAID REACTION MIXTURE BEING SOLUBLE THEREIN, AND THE POLYVINYL ALCOHOL PRODUCED BEING ISOLUBLE THEREIN, REMOVING FROM SAID REACTION MIXTURE THE RESULTING SOLVENT INSOLUBLE POLYVINYL ALCOHOL AND CARBOXYLIC ACID ESTER AND ADDING HYDROLYTIC ALCOHOL TO SAID REACTION MIXTURE AT A RATE SO AS TO MAINTAIN SAID POLYVINYL ALCOHOL IN AN EASILY MANAGEABLE SUSPENSION.
Claim 2
Dependent Claim
134 words
A PROCESS WHICH COMPRISES REACTING THE POLYMER IZED VINYL ESTER OF A SATURATED CARBOXYLIC ACID CONTAINING 1 TO 4 CARBON ATOMS WITH A HYDROLYTIC ALCOHOL CONTAINING 1 TO 4 CARBON ATOMS IN THE PRESENCE OF AN ALKALI METAL ALCOHOLATE CATALYST UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS, MAINTAINING SAID ALCOHOLATE CONCENTRATION BETWEEN ABOUT 0.05 TO 5% BY WEIGHT OF THE REACTION MIXTURE, MAINTAINING THE CONCENTRATION OF SAID POLYVINYL ESTER BETWEEN ABOUT 0.1 AND 1% BY WEIGHT OF SAID REACTION MIXTURE, SAID POLYVINYL ESTER PRESENT IN SAID REACTION MIXTURE BEING SOLUBLE THEREIN, AND THE POLYVINYL ALCOHOL PRODUCED BEING ISOLUBLE THEREIN, REMOVING FROM SAID REACTION MIXTURE THE RESULTING SOLVENT INSOLUBLE POLYVINYL ALCOHOL AND CARBOXYLIC ACID ESTER AND ADDING HYDROLYTIC ALCOHOL TO SAID REACTION MIXTURE AT A RATE SO AS TO MAINTAIN SAID POLYVINYL ALCOHOL IN AN EASILY MANAGEABLE SUSPENSION.
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) | 1959-02-06 | 1959-08-08 | 1960-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-02-06 | 1963-08-08 | 1964-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-02-06 | 1967-08-08 | 1968-02-07 | $7700.00 | Window Closed / Lapsed |