US2850489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyvinyl alcohol from polyvinyl ester
Assignee: EIDP Inc
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Filing: 1953-11-10
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Granted: 1958-09-02
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Expires: 1973-11-10
Abstract
No abstract record available.
Inventors
- 👤 Turnbull Norris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:03
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
108 words
IN THE PROCESS FOR PRODUCING POLYVINYL ALCOHOL OF IMPROVED COLOR THE STEPS COMPRISING TREATING FOR A PERIOD NOT TO EXCEED ABOUT 2 HOURS AN ALCONOLIC SOLUTION OF POLYVINYL ACETATE WITH ABOUT 0.01 TO 0.3% BY WEIGHT OF A STRONG ACID BASED ON THE WEIGHT OF SAID ACETATE, THEREAFTER SUBJECTING SAID POLYVINYL ACETATE IN SOLUTION TO ALCOBOLYSIS BY TREATMENT WITH ALKALI METAL ALCOHOLATE IN CATALYTIC PROPORTIONS IN THE PRESENCE OF ABOUT 0.1 TO 0.5% BY WEIGHT OF AN ALDEHYDE COMPLEXING AGENT AND IN THE PRESENCE OF ABOUT 0.1 TO 0.5% BY WEIGHT OF A REDUCING AGENT, SAID AGENTS BEING SUBSTANTIALLY NON-REACTIVE WITH THE NON-COLOR-FORMING COMPONENTS OF THE ALCOHOLYSIS MIXTURE.
Claim 2
Dependent Claim
108 words
IN THE PROCESS FOR PRODUCING POLYVINYL ALCOHOL OF IMPROVED COLOR THE STEPS COMPRISING TREATING FOR A PERIOD NOT TO EXCEED ABOUT 2 HOURS AN ALCONOLIC SOLUTION OF POLYVINYL ACETATE WITH ABOUT 0.01 TO 0.3% BY WEIGHT OF A STRONG ACID BASED ON THE WEIGHT OF SAID ACETATE, THEREAFTER SUBJECTING SAID POLYVINYL ACETATE IN SOLUTION TO ALCOBOLYSIS BY TREATMENT WITH ALKALI METAL ALCOHOLATE IN CATALYTIC PROPORTIONS IN THE PRESENCE OF ABOUT 0.1 TO 0.5% BY WEIGHT OF AN ALDEHYDE COMPLEXING AGENT AND IN THE PRESENCE OF ABOUT 0.1 TO 0.5% BY WEIGHT OF A REDUCING AGENT, SAID AGENTS BEING SUBSTANTIALLY NON-REACTIVE WITH THE NON-COLOR-FORMING COMPONENTS OF THE ALCOHOLYSIS MIXTURE.
Claim 3
Dependent Claim
79 words
IN A PROCESS FOR THE PRODUCTION OF POLYVINYL ALCOHOL OF IMPROVED COLOR THE STEPS COMPRISING THE ALCOHOLYSIS OF POLYVINYL ACETATE IN AN ALCOHOL SOLUTION BY SUBJECTING SAID ACETATE TO THE CATALYTIC ACTION OF ALKALI METAL ALCOHOLATE IN THE PRESENCE OF ABOUT 0.1 TO 0.5% BY WEIGHT OF AN ALDEHYDE COMPLEXING AGENT AND IN THE PRESENCE OF ABOUT 0.1 TO 0.5% BY WEIGHT OF A REDUCING AGENT, SAID AGENTS BEING SUBSTANTIALLY NON-REACTIVE WITH THE NON-COLOR-FORMING COMPONENTS OF THE ALCOHOLYSIS MIXTURE.
Claim 4
Dependent Claim
79 words
IN A PROCESS FOR THE PRODUCTION OF POLYVINYL ALCOHOL OF IMPROVED COLOR THE STEPS COMPRISING THE ALCOHOLYSIS OF POLYVINYL ACETATE IN AN ALCOHOL SOLUTION BY SUBJECTING SAID ACETATE TO THE CATALYTIC ACTION OF ALKALI METAL ALCOHOLATE IN THE PRESENCE OF ABOUT 0.1 TO 0.5% BY WEIGHT OF AN ALDEHYDE COMPLEXING AGENT AND IN THE PRESENCE OF ABOUT 0.1 TO 0.5% BY WEIGHT OF A REDUCING AGENT, SAID AGENTS BEING SUBSTANTIALLY NON-REACTIVE WITH THE NON-COLOR-FORMING COMPONENTS OF THE ALCOHOLYSIS 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) | 1961-09-01 | 1962-03-03 | 1962-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-01 | 1966-03-03 | 1966-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-01 | 1970-03-03 | 1970-09-02 | $7700.00 | Window Closed / Lapsed |