US2555050A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of polyvinyl alcoholmaleic acid-acetic acid esters
Assignee: Imperial Chemical Industries Ltd
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Filing: 1947-07-08
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Granted: 1951-05-29
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Expires: 1967-07-08
Abstract
No abstract record available.
Inventors
- 👤 Lyne Ralph Robert
- 👤 Arthur W S Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:48
CPC Classifications
C; C08; C08F; C08F8/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
101 words
A METHOD FOR THE PRODUCTION OF AN ACID ESTER OF POLYVINYL ALCOHOL PARTIALLY ESTERIFIED WITH MALEIC ACID GROUPS AND WITH ACETIC ACID GROUPS HAVIG A VINYL ALOCHOL CONTENT IN EXCESS OF 9% WHICH COMPRISES HEATING POLYVINYL ACETATE, A MATERIAL FROM THE GROUP CONSISTING OF MALEIC ACID AND MALEIC ANHYDRIDE, AND WATER TOGETHER AT A TEMPERATURE OF ABOUT 150* TO 160* C. IN THE SUBSTANTIAL ABSENCE OF ANY OTHER MATERIALS, WITH SAID THREE REACTANTS BEING PRESENT IN THE RATIO OF BETWEEN 10 TO 35 PARTS OF WATER AND 55 TO 65 PARTS OF SAID MATERIAL FOR EVERY 120 PARTS OF POLYVINYL ACETATE.
References Cited (Backward Citations)
US2145345A
Cited
US2275685A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-28 | 1954-11-27 | 1955-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-28 | 1958-11-27 | 1959-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-28 | 1962-11-27 | 1963-05-29 | $7700.00 | Window Closed / Lapsed |