US2855387A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Terpolymer of maleic anhydride, vinyl acetate and alkyl acrylate
Assignee: Monsanto Chemicals Ltd
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Filing: 1954-12-20
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Granted: 1958-10-07
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Expires: 1974-12-20
Abstract
No abstract record available.
Inventors
- 👤 Gerald R Barrett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:22
CPC Classifications
C; C08; C08F; C08F22/00; C08F22/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
A TERPOLYMER OF VINYL ACETATE, MALEIC ANHYDRIDE AND AN ESTER TAKEN FROM THE GROUP CONSISTING OF ALKYL ESTERS OF ACRYLIC AND METHACRYLIC ACIDS IN WHICH THE ALKYL GROUPS CONTAIN FROM 1 TO 8 CARBON ATOMS, THE RATIO OF VINYL ACETATE TO MALEIC ANHYDRIDE ON A MOL PERCENT BASIS VARYING FROM 52-48 TO 50-50 AND THE AMOUNT OF ESTER VARYING FROM 1-30 MOL PERCENT OF THE TERPOLYMER.
Claim 2
Dependent Claim
66 words
A TERPOLYMER OF VINYL ACETATE, MALEIC ANHYDRIDE AND AN ESTER TAKEN FROM THE GROUP CONSISTING OF ALKYL ESTERS OF ACRYLIC AND METHACRYLIC ACIDS IN WHICH THE ALKYL GROUPS CONTAIN FROM 1 TO 8 CARBON ATOMS, THE RATIO OF VINYL ACETATE TO MALEIC ANHYDRIDE ON A MOL PERCENT BASIS VARYING FROM 52-48 TO 50-50 AND THE AMOUNT OF ESTER VARYING FROM 1-30 MOL PERCENT OF THE TERPOLYMER.
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) | 1961-10-06 | 1962-04-07 | 1962-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-06 | 1966-04-07 | 1966-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-06 | 1970-04-07 | 1970-10-07 | $7700.00 | Window Closed / Lapsed |