US3560457A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of forming copolymers of maleic anhydride and an aliphatic olefin having from 12 to 14 carbon atoms
Assignee: Gulf Research and Development Co
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Filing: 1969-05-26
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Granted: 1971-02-02
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Expires: 1989-05-26
Abstract
Abstract MALEIC ANHYDRIDE AND AN ALIPHATIC OLDFIN HAVING FROM 12 TO 14 CARBON ATOMS, SUCH AS 1-DODECENE, ARE COPOLYMERIZED IN THE PRESENCE OF THE FREE RADICAL CATALYST AND A SOLVENT SUCH AS A SATURATED DIHALOGENATED ALIPHATIC LIQUID HYDROCARBON HAVING FROM ONE TO FIVE CARBON ATOMS, FOR EXAMPLE, PROPYLENE DICHLORIDE. ENOUGH SOLVENT IS EMPLOYED TO SOLUBILIZE NOT ONLY THE REACTANTS BUT ALSO THE COPOLYMER PRODUCTS. THE COPOLYMER IS PRECIPITATED IN A FILTERABLE PARTICULATE SOLID FORM BY ADMIXING THE ENTIRE REACTION PRODUCT WITH AN ALIPHATIC MONOHYDROXY ALCOHOL HAVING FROM THREE TO FOUR CARBON ATOMS, SUCH AS NPROPANOL AND N-BUTANOL.
Inventors
- 👤 Stanley M Hazen
- 👤 William J Heilman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:11
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08F; C08F10/00; C08F22/00; C08F22/04
Claims Analysis
Total Claims: 0
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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) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |