US2668810A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the saponification of polyvinyl esters
Assignee: Wacker Chemie AG
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Filing: 1952-04-21
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Granted: 1954-02-09
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Expires: 1972-04-21
Abstract
No abstract record available.
Inventors
- 👤 Bergmeister Eduard
- 👤 Heckmaier Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:08
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
49 words
THE PROCESS FOR SAPONIFYING POLYVINYL ESTERS FINELY DIVIDED IN WATER WHICH COMPRISES HEATING SAME IN THE PRESENCE OF A MEMBER SELECTED FROM THE GROUP CONSISTING OF HYDROCHLORIC AND SULFURIC ACIDS AND 0.1-5% OF A MEMBER SELECTED FROM THE GROUP CONSISTING OF PERCHLORIC ACID AND A WATER-SOLUBLE NEUTRAL SALT THEREOF.
Claim 2
Dependent Claim
49 words
THE PROCESS FOR SAPONIFYING POLYVINYL ESTERS FINELY DIVIDED IN WATER WHICH COMPRISES HEATING SAME IN THE PRESENCE OF A MEMBER SELECTED FROM THE GROUP CONSISTING OF HYDROCHLORIC AND SULFURIC ACIDS AND 0.1-5% OF A MEMBER SELECTED FROM THE GROUP CONSISTING OF PERCHLORIC ACID AND A WATER-SOLUBLE NEUTRAL SALT THEREOF.
References Cited (Backward Citations)
DE528741C
Cited
US2547618A
Cited
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 |