US3658775A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alternate copolymer of butadiene and acrylonitrile and a process for preparation thereof
Assignee: Maruzen Petrochemical Co Ltd
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Filing: 1969-06-26
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Granted: 1972-04-25
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Expires: 1989-06-26
Abstract
Abstract ALTERNATE COPOLYMER OF BUTADIENE AND ACRYLONITRILE WHICH IS A NOVEL PRODUCT AND A PROCESS FOR PREPARATION THEREOF WHICH COMPRISES CONTACTING A MIXTURE OF BUTADIENE AND ACRYLONITRILE IN LIQUID PHASE WITH THE CATALYST SYSTEM FORMED BY MIXING VANADIUM (V) OXYCHLORIDE OR CHROMIUM (VI) OXYCHLORIDE WITH A TRIALKYLALUMINUM COMPOUND.
Inventors
- 👤 Akihiro Kawasaki
- 👤 Masanobu Taniguchi
- 👤 Tsuneto Nishiyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:16
CPC Classifications
C; C08; C08F; C08F236/00; C08F236/02; C08F236/04; C08F236/12; Y; Y10; Y10S; Y10S526/00; Y10S526/902
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) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |