Patent US2980653A successfully refreshed from Google Patents.
US2980653A
Expired / Lapsed
US
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Manufacture of low molecular weight olefin/maleic anhydride copolymers
Assignee: Monsanto Chemicals Ltd
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Filing: 1956-12-21
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Granted: 1961-04-18
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Expires: 1976-12-21
Abstract
No abstract record available.
Inventors
- 👤 John H Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:41
CPC Classifications
C; C08; C08F; C08F22/00; C08F22/04; C08F10/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 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 AT A TEMPERATURE WITHIN THE RANGE OF 40-100*C. TO FORM AN OLEFIN/ MALEIC ANHYDRIDE COPOLYMER, THE IMPROVEMENT WHICH COMPRISES EFFECTING SAID COPOLYMERIZATION IN A NONAQUEOUS REACTION MIXTURE COMPRISING A LIQUID ORGANIC SOLVENT AND AT LEAST 5 MOLE PERCENT BASED ON THE REACTING MONOMERS OF A HYDROCARBON CARBOXYLIC ACID FREE FROM ALIPHATIC UNSATURATION AND HAVING AT LEAST ONE HYDROGEN ATOM ON AN A-CARBON.
Claim 2
Dependent Claim
86 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 AT A TEMPERATURE WITHIN THE RANGE OF 40-100*C. TO FORM AN OLEFIN/ MALEIC ANHYDRIDE COPOLYMER, THE IMPROVEMENT WHICH COMPRISES EFFECTING SAID COPOLYMERIZATION IN A NONAQUEOUS REACTION MIXTURE COMPRISING A LIQUID ORGANIC SOLVENT AND AT LEAST 5 MOLE PERCENT BASED ON THE REACTING MONOMERS OF A HYDROCARBON CARBOXYLIC ACID FREE FROM ALIPHATIC UNSATURATION AND HAVING AT LEAST ONE HYDROGEN ATOM ON AN A-CARBON.
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) | 1964-04-17 | 1964-10-17 | 1965-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-17 | 1968-10-17 | 1969-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-17 | 1972-10-17 | 1973-04-18 | $7700.00 | Window Closed / Lapsed |