US3124562A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of polyvinyl alcohol
Assignee: —
•
Filing: —
•
Granted: 1964-03-10
•
Expires: 1981-03-10
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:51
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
A PROCESS OF PRODUCING A POLYVINYL ALCOHOL HAVING A DEGREE OF POLYMERIZATION OF ABOUT 100 TO 1500 FROM A POLYVINYL ESTER WHICH COMPRISES SIMULTANEOUSLY SAPONIFYING AND DEGRADING SAID ESTER IN AN ALKALINE MEDIUM CONTAINING AN ALKALINE SAPONIFICATION CATALYST AND A SMALL BUT EFFECTIVE AMOUNT OF AN OXIDIZER SELECTED FROM THE GROUP CONSISTING OF PERIODIC ACID, ALKALI METAL PERIODATES AND ALKALINE EARTH METAL PERIODATES, AND RECOVERING POLYVINYL ALCOHOL HAVING A DEGREE OF POLYMERIZATION WHICH IS IN THE RANGE OF ABOUT 100 TO 1500 AND LOWER THAN THE DEGREE OF POLYMERIZATION OF POLYVINYL ALCOHOL PRODUCED BY ALKALINE SAPONIFICATION OF SAID ESTER IN THE ABSENCE OF ANY OXIDIZER.
Claim 2
Dependent Claim
105 words
A PROCESS OF PRODUCING A POLYVINYL ALCOHOL HAVING A DEGREE OF POLYMERIZATION OF ABOUT 100 TO 1500 FROM A POLYVINYL ESTER WHICH COMPRISES SIMULTANEOUSLY SAPONIFYING AND DEGRADING SAID ESTER IN AN ALKALINE MEDIUM CONTAINING AN ALKALINE SAPONIFICATION CATALYST AND A SMALL BUT EFFECTIVE AMOUNT OF AN OXIDIZER SELECTED FROM THE GROUP CONSISTING OF PERIODIC ACID, ALKALI METAL PERIODATES AND ALKALINE EARTH METAL PERIODATES, AND RECOVERING POLYVINYL ALCOHOL HAVING A DEGREE OF POLYMERIZATION WHICH IS IN THE RANGE OF ABOUT 100 TO 1500 AND LOWER THAN THE DEGREE OF POLYMERIZATION OF POLYVINYL ALCOHOL PRODUCED BY ALKALINE SAPONIFICATION OF SAID ESTER IN THE ABSENCE OF ANY OXIDIZER.
References Cited (Backward Citations)
US2642420A
Cited
US2668810A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-03-10 | 1967-09-09 | 1968-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-03-10 | 1971-09-09 | 1972-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-03-10 | 1975-09-09 | 1976-03-10 | $7700.00 | Window Closed / Lapsed |