US3741943A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of maleic acid copolymers and hydroxy derivatives thereof
Assignee: DeSoto Inc
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Filing: 1971-05-03
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Granted: 1973-06-26
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Expires: 1991-05-03
Abstract
Abstract STYRENE OR LIKE MONOMER IS COPOLYMERIZED WITH MALEIC ANHYDRIDE IN THE PRESENCE OF WATER AND WATER-MISCIBLE ORGANIC SOLVENT TO SIMULTANEOUSLY EFFECT COPOLYMERIZATION AND HYDROLYSIS AND DIRECTLY PROVIDE AN ACID COPOLYMER WHICH CAN BE REACTED WITH MONOEPOXIDE TO PROVIDE DERIVATIVES HAVING INCREASED HYDROXY FUNCTIONALITY.
Inventors
- 👤 K Sekmakas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:55
CPC Classifications
C; C08; C08F; C08F22/00; C08F22/04; C08F8/00; C08L; C08L35/00; C08L35/06
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) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |