US2913437A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low molecular weight olefin/maleic anhydride copolymers made in special solvent systems
Assignee: Monsanto Chemicals Ltd
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Filing: 1956-08-10
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Granted: 1959-11-17
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Expires: 1976-08-10
Abstract
No abstract record available.
Inventors
- 👤 John H Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:19
CPC Classifications
C; C08; C08F; C08F22/00; C08F22/04; Y; Y10; Y10S; Y10S424/00; Y10S424/01
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
IN THE COPOLYMERIZATION OF MALEIC ANHYDRIDE WITH AN OLEFIN HAVING FROM 2 TO 4 CARBON ATOMS IN THE PRESENCE OF A FREE RADICAL PROMOTING CATALYST TO FORM AN OLEFIN/MALEIC ANHYDRIDE COPOLYMER, THE IMPROVEMENT WHICH COMPRISES EFFECTING SAID COPOLYMERIZATION AT 40 TO 80* C. IN THE PRESENCE OF SUFFICIENT INERT LIQUID SOLVENT FOR MALEIC ANHYDRIDE SELECTED FROM THE GROUP CONSISTING OF BENZENE, HALOBENZENES, AND HALOPARAFFINS TO DISSOLVE ALL THE MALEIC ANHYDRIDE, PLUS AT LEAST 10 MOLE PERCENT BASED UPON THE REACTING MONOMERS OF AN ALKYLATED AROMATIC HYDROCARBON HAVING AT LEAST ONE HYDROGEN ATOM ALPHA TO AN AROMATIC RING AND CONTAINING FROM 8 TO 15 CARBON ATOMS.
Claim 2
Dependent Claim
105 words
IN THE COPOLYMERIZATION OF MALEIC ANHYDRIDE WITH AN OLEFIN HAVING FROM 2 TO 4 CARBON ATOMS IN THE PRESENCE OF A FREE RADICAL PROMOTING CATALYST TO FORM AN OLEFIN/MALEIC ANHYDRIDE COPOLYMER, THE IMPROVEMENT WHICH COMPRISES EFFECTING SAID COPOLYMERIZATION AT 40 TO 80* C. IN THE PRESENCE OF SUFFICIENT INERT LIQUID SOLVENT FOR MALEIC ANHYDRIDE SELECTED FROM THE GROUP CONSISTING OF BENZENE, HALOBENZENES, AND HALOPARAFFINS TO DISSOLVE ALL THE MALEIC ANHYDRIDE, PLUS AT LEAST 10 MOLE PERCENT BASED UPON THE REACTING MONOMERS OF AN ALKYLATED AROMATIC HYDROCARBON HAVING AT LEAST ONE HYDROGEN ATOM ALPHA TO AN AROMATIC RING AND CONTAINING FROM 8 TO 15 CARBON ATOMS.
References Cited (Backward Citations)
US2396785A
Cited
US2675370A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-11-16 | 1963-05-18 | 1963-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-16 | 1967-05-18 | 1967-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-16 | 1971-05-18 | 1971-11-17 | $7700.00 | Window Closed / Lapsed |