US2938016A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Olefin/maleic anhydride copolymers of low molecular weight
Assignee: Monsanto Chemicals Ltd
•
Filing: 1956-08-10
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Granted: 1960-05-24
•
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 14:54
CPC Classifications
C; C08; C08F; C08F22/00; C08F22/04; Y; Y10; Y10S; Y10S424/00; Y10S424/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
58 words
IN THE COPOLYMERIZATION OF MALEIC ANHYDRIDE WITH AN OLEFIN HAVING FROM 2 TO 4 CARBON ATOMS WITH THE AID OF A FREE-RADICAL PROMOTING CATALYST TO FORM AN OLEFIN/ MALEIC ANHYDRIDE COPOLYMER, THE IMPROVEMENT WHICH COMPRISES EFFECTING SAID COPOLYMERIZATION AT A TEMPERATURE WITHIN THE RANGE OF 40 TO 80*C. AND IN THE PRESENCE OF AN ALDEHYDE HAVING THE FORMULA
Claim 2
Dependent Claim
58 words
IN THE COPOLYMERIZATION OF MALEIC ANHYDRIDE WITH AN OLEFIN HAVING FROM 2 TO 4 CARBON ATOMS WITH THE AID OF A FREE-RADICAL PROMOTING CATALYST TO FORM AN OLEFIN/ MALEIC ANHYDRIDE COPOLYMER, THE IMPROVEMENT WHICH COMPRISES EFFECTING SAID COPOLYMERIZATION AT A TEMPERATURE WITHIN THE RANGE OF 40 TO 80*C. AND IN THE PRESENCE OF AN ALDEHYDE HAVING THE FORMULA
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-24 | 1963-11-23 | 1964-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-24 | 1967-11-23 | 1968-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-24 | 1971-11-23 | 1972-05-24 | $7700.00 | Window Closed / Lapsed |