US2536980A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyvinyl alcohol-1-butene-1,3-dione reaction product and process for producing the same
Assignee: GAF Chemicals Corp
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Filing: 1947-05-02
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Granted: 1951-01-02
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Expires: 1967-05-02
Abstract
No abstract record available.
Inventors
- 👤 Giffin D Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:55
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/14; C08F216/00; C08F216/02; C08F216/04; C08F216/06; C08F8/30; C08K; C08K5/00; C08K5/16; C08K5/22; C08K5/24; C08K5/25; D; D06; D06M; D06M15/00; D06M15/19; D06M15/21; D06M15/327; D06M15/333; D06M15/347; G; G03; G03C; G03C1/00; G03C1/005; G03C1/04; G03C1/053; C08F2810/00; C08F2810/20; D06M2200/00; D06M2200/20; D06M2200/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
39 words
PARTIAL ACETOACETIC ACID ESTERS OF WATERSOLUBLE POLYVINYL ALCOHOL, WHOSE 4% WATER SOLUTION HAS A VISCOSITY OF FROM 15-30 CENTIPOISES AT 20* C. AND IN WHICH FROM 4.5 TO 10% OF THE AVAILABLE HYDROXYL GROUPS ARE ESTERIFIED WITH ACETOACETIC ACID.
Claim 2
Dependent Claim
39 words
PARTIAL ACETOACETIC ACID ESTERS OF WATERSOLUBLE POLYVINYL ALCOHOL, WHOSE 4% WATER SOLUTION HAS A VISCOSITY OF FROM 15-30 CENTIPOISES AT 20* C. AND IN WHICH FROM 4.5 TO 10% OF THE AVAILABLE HYDROXYL GROUPS ARE ESTERIFIED WITH ACETOACETIC ACID.
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) | 1954-01-01 | 1954-07-03 | 1955-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-01 | 1958-07-03 | 1959-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-01 | 1962-07-03 | 1963-01-02 | $7700.00 | Window Closed / Lapsed |