Patent US2862916A successfully refreshed from Google Patents.
US2862916A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of polyvinyl alcohol
Assignee: Celanese Corp
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Filing: 1955-08-22
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Granted: 1958-12-02
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Expires: 1975-08-22
Abstract
No abstract record available.
Inventors
- 👤 John C Lukman
- 👤 Orville G Lowe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:21
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
A PROCESS FOR THE PRODUCTION OF POLYVINYL ALCOHOL WHICH COMPRISES ALCOHOLIZING POLYVINYL ACETATE DISSOLVED IN ETHANOL IN THE PRESENCE OF AN ALKALINE ALCOHOLYSIS CATALYST AND A BASIC NITROGENOUS COMPOUND SELECTED FROM THE GROUP CONSISTING OF HYDRAZINE, HYDROXYLAMINE, BUTYLAMINE AND ETHYLENE DIAMINE THAT WILL REACT WITH ALDEHYDES UNDER THE CONDITIONS OF THE REACTION TO FORM A COLORLESS PRODUCT.
Claim 2
Dependent Claim
57 words
A PROCESS FOR THE PRODUCTION OF POLYVINYL ALCOHOL WHICH COMPRISES ALCOHOLIZING POLYVINYL ACETATE DISSOLVED IN ETHANOL IN THE PRESENCE OF AN ALKALINE ALCOHOLYSIS CATALYST AND A BASIC NITROGENOUS COMPOUND SELECTED FROM THE GROUP CONSISTING OF HYDRAZINE, HYDROXYLAMINE, BUTYLAMINE AND ETHYLENE DIAMINE THAT WILL REACT WITH ALDEHYDES UNDER THE CONDITIONS OF THE REACTION TO FORM A COLORLESS PRODUCT.
References Cited (Backward Citations)
US1973724A
Cited
US2642420A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-01 | 1962-06-02 | 1962-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-01 | 1966-06-02 | 1966-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-01 | 1970-06-02 | 1970-12-02 | $7700.00 | Window Closed / Lapsed |