Patent US2808393A successfully refreshed from Google Patents.
US2808393A
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Terpolymer of vinyl acetate, maleic anhydride and a beta alkoxy ethyl partial ester of maleic acid
Assignee: Monsanto Chemicals Ltd
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Filing: 1954-12-15
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Granted: 1957-10-01
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Expires: 1974-12-15
Abstract
No abstract record available.
Inventors
- 👤 Alva F Harris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:46
CPC Classifications
C; C08; C08F; C08F218/00; C08F218/02; C08F218/04; C08F218/08; C08F22/00; C08F22/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
A TERPOLYMER OF VINYL ACETATE, MELEIC ANHYDRIDE AND A BETA ALKOXY ETHYL PARTIAL ESTER OF MALEIC ACID WHEREIN THE RATIO OF VINYL ACETATE TO COMBINED MALEIC ANHYDRIDE AND MALEIC PARTIAL ESTER VARIES FROM 52-48 TO 50-50 ON A MOL PERCENT BASIS, THE RATIO OF MALEIC ANHYDRIDE TO MALEIC PARTIAL ESTER VARIES FROM 40-10 TO 30-20 ON A MOL PERCENT BASIS AND THE DEGREE OF ESTERIFICATION OF THE MALEIC PARTIAL ESTER IS FROM 20-50%.
Claim 2
Dependent Claim
73 words
A TERPOLYMER OF VINYL ACETATE, MELEIC ANHYDRIDE AND A BETA ALKOXY ETHYL PARTIAL ESTER OF MALEIC ACID WHEREIN THE RATIO OF VINYL ACETATE TO COMBINED MALEIC ANHYDRIDE AND MALEIC PARTIAL ESTER VARIES FROM 52-48 TO 50-50 ON A MOL PERCENT BASIS, THE RATIO OF MALEIC ANHYDRIDE TO MALEIC PARTIAL ESTER VARIES FROM 40-10 TO 30-20 ON A MOL PERCENT BASIS AND THE DEGREE OF ESTERIFICATION OF THE MALEIC PARTIAL ESTER IS FROM 20-50%.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-30 | 1961-04-01 | 1961-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-30 | 1965-04-01 | 1965-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-30 | 1969-04-01 | 1969-10-01 | $7700.00 | Window Closed / Lapsed |