US3645988A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pyridyl acrylates and methacrylates and dyeable acrylonitrile copolymers prepared therefrom
Assignee: Dow Chemical Co
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Filing: 1969-06-17
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Granted: 1972-02-29
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Expires: 1989-06-17
Abstract
Abstract PYRIDYL ACRYLATES OR METHACRYLATES ARE PREPARED BY REACTING THE SODIUM SALT OF A HYDROXY SUBSTITUTED PYRIDINE WITH ACRYLYL OR METHACRYLYL CHLORIDE. COPOLYMERIZATION OF SMALL AMOUNTS OF THE RESULTING MONOMER (E.G. 1-10%) WITH A MAJOR PROPORTIN (E.G. 85-99%) OF ACRYLONITRILE, OPTIONALLY CONTAINING UP TO ABOUT 10% OF ANOTHER COPOLYMERIZABLE MONOMER (E.B. METHYL ACRYLATE) AND SPINNING, RESULTS IN FIBERS HAVING EXCELLENT DYEABILITY AND HEAT STABILITY.
Inventors
- 👤 Gary G Hammer
- 👤 John H Hennes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:35
CPC Classifications
C; C08; C08F; C08F220/00; C08F220/02; C08F220/42; C08F220/44
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) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |