Patent US2990398A successfully refreshed from Google Patents.
US2990398A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydroxyethylation of polyvinyl alcohol
Assignee: EIDP Inc
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Filing: 1958-07-31
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Granted: 1961-06-27
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Expires: 1978-07-31
Abstract
No abstract record available.
Inventors
- 👤 Harold K Inskip
- 👤 Klabunde Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:24
CPC Classifications
C; C08; C08F; C08F8/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
A PROCESS FOR THE PRODUCTION OF HYDROXYETHLATED POLYVINYL ALCOHOL CONTAINING FROM ABOUT 10% TO ABOUT 50% BY WEIGHT OF CHEMICALLY BOUND ETHYLENE OXIDE COMPRISING HEATING A REACTION MIXTURE COMPRISING POLYVINYL ALCOHOL, FROM 10 TO 200% BY WEIGHT BASED ON SAID POLYVINYL ALCOHOL OF ETHYLENE OXIDE, AND AT LEAST ABOUT 100% BY WEIGHT BASED ON SAID POLYVINYL ALCOHOL OF AN INERT LIQUID DILUENT SELECTED FROM THE GROUP CONSISTING OF METHYL ACETATE AND ETHYL ACETATE, UNDER AUTOGENOUS PRESSURE AT A TEMPERATURE FROM ABOUT 75*C. TO ABOUT 150*C. AND MECHANICALLY SEPARATING THE INSOLUBLE HYDROXYETHYLATED POLYVINYL ALCOHOL CONTAINING FROM ABOUT 10% TO ABOUT 50% BY WEIGHT OF CHEMICALLY BOUND ETHYLENE OXIDE FROM THE REACTION MIXTURE.
Claim 2
Dependent Claim
111 words
A PROCESS FOR THE PRODUCTION OF HYDROXYETHLATED POLYVINYL ALCOHOL CONTAINING FROM ABOUT 10% TO ABOUT 50% BY WEIGHT OF CHEMICALLY BOUND ETHYLENE OXIDE COMPRISING HEATING A REACTION MIXTURE COMPRISING POLYVINYL ALCOHOL, FROM 10 TO 200% BY WEIGHT BASED ON SAID POLYVINYL ALCOHOL OF ETHYLENE OXIDE, AND AT LEAST ABOUT 100% BY WEIGHT BASED ON SAID POLYVINYL ALCOHOL OF AN INERT LIQUID DILUENT SELECTED FROM THE GROUP CONSISTING OF METHYL ACETATE AND ETHYL ACETATE, UNDER AUTOGENOUS PRESSURE AT A TEMPERATURE FROM ABOUT 75*C. TO ABOUT 150*C. AND MECHANICALLY SEPARATING THE INSOLUBLE HYDROXYETHYLATED POLYVINYL ALCOHOL CONTAINING FROM ABOUT 10% TO ABOUT 50% BY WEIGHT OF CHEMICALLY BOUND ETHYLENE OXIDE FROM THE REACTION 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) | 1964-06-26 | 1964-12-26 | 1965-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-26 | 1968-12-26 | 1969-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-26 | 1972-12-26 | 1973-06-27 | $7700.00 | Window Closed / Lapsed |