US2668809A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of high viscosity polyvinyl alcohol
Assignee: EIDP Inc
•
Filing: 1949-11-22
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Granted: 1954-02-09
•
Expires: 1969-11-22
Abstract
No abstract record available.
Inventors
- 👤 Harold W Bryant
- 👤 William R Cornthwaite
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:49
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/12; Y; Y10; Y10S; Y10S260/00; Y10S260/31
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
A PROCESS FOR THE PRODUCTION OF POLYVINYL ALCOHOL WHICH COMPRISES POLYMERIZING VINYL ACETATE IN THE PRESENCE OF A TERMINALLY UNSATURATED MONO-OLEFIN CONTAINING 12 TO 18 CARBON ATOMS THE AMOUNT OF SAID MONO-OLEFIN BEING EQUAL TO 0.01 TO 10% OT THE WEIGHT OF SAID VINYL ACETATE AND THE AMOUNT OF ANY VINYL ACETATE SOLVENT PRESENT DURING POLYMERIZATION VARYING FROM ZERO TO 30% BY WEIGHT OF THE VINYL ACETATE AND SAPONIFYING THE RESULTING POLYVINYL ACETATE UNTIL AT LEAST ABOUT 75% OF THE ACETATE GROUPS HAVE BEEN CONVERTED TO HYDROXYL.
Claim 2
Dependent Claim
87 words
A PROCESS FOR THE PRODUCTION OF POLYVINYL ALCOHOL WHICH COMPRISES POLYMERIZING VINYL ACETATE IN THE PRESENCE OF A TERMINALLY UNSATURATED MONO-OLEFIN CONTAINING 12 TO 18 CARBON ATOMS THE AMOUNT OF SAID MONO-OLEFIN BEING EQUAL TO 0.01 TO 10% OT THE WEIGHT OF SAID VINYL ACETATE AND THE AMOUNT OF ANY VINYL ACETATE SOLVENT PRESENT DURING POLYMERIZATION VARYING FROM ZERO TO 30% BY WEIGHT OF THE VINYL ACETATE AND SAPONIFYING THE RESULTING POLYVINYL ACETATE UNTIL AT LEAST ABOUT 75% OF THE ACETATE GROUPS HAVE BEEN CONVERTED TO HYDROXYL.
References Cited (Backward Citations)
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US2386347A
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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) | 1957-02-08 | 1957-08-10 | 1958-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-08 | 1961-08-10 | 1962-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-08 | 1965-08-10 | 1966-02-09 | $7700.00 | Window Closed / Lapsed |