Patent DE277419C successfully refreshed from Google Patents.
US3573235A
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Polymerization of acrylonitrile in a concentrated solution of zinc chloride comprising the use of zinc sulfite as the reducing agent of a redox initiator
Assignee: Toyobo Co Ltd
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Filing: 1969-09-22
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Granted: 1971-03-30
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Expires: 1989-09-22
Abstract
Abstract A PROCESS FOR POLYMERIZING ACRYLONITRILE IN A CONCENTRATED AQUEOUS SOLUTION OF ZINC CHLORIDE IN THE PRESENCE OF A REDOX POLYMERIZATION INITIATOR WHEREIN ZINC SULFITE IS USED AS THE REDUCING AGENT.
Inventors
- 👤 Akira Yamamoto
- 👤 Zenjiro Momiyama
- 👤 Heiichiro Murakami
- 👤 Kunio Nakaoji
- 👤 Tatsuhiko Shizuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:41
CPC Classifications
C; C08; C08F; C08F291/00; C08F2/00; C08F2/12; C08F2/16; C08F20/00; C08F20/02; C08F20/42; C08F20/44
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) | 1974-03-29 | 1974-09-28 | 1975-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-29 | 1978-09-28 | 1979-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-29 | 1982-09-28 | 1983-03-30 | $7700.00 | Window Closed / Lapsed |