Patent US3629357A successfully refreshed from Google Patents.
US3629357A
Expired / Lapsed
US
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Production of maleic acid copolymers and hydroxy derivatives thereof
Assignee: DeSoto Inc
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Filing: 1969-04-16
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Granted: 1971-12-21
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Expires: 1989-04-16
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
- 👤 Kazys Sekmakas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:25
CPC Classifications
C; C08; C08F; C08F22/00; C08F22/04; C08F222/00; C08F222/04; C08F222/06; C08F222/08; 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) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |