US3580895A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of copolymers in the presence of an organolithium compound and an orthoester
Assignee: Bridgestone Corp
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Filing: 1968-12-03
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Granted: 1971-05-25
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Expires: 1988-12-03
Abstract
Abstract RANDOM COPOLYMER IS PREPARED BY COPOLYMERIZING A CONJUGATED DIENE, SUCH AS 1,3-BUTADIENE AND A VINYLSUBSTITUTED AROMATIC HYDROCARBON, SUCH AS STYRENE AT A TEMPERATURE OF -80* TO 150*C. IN THE PRESENCE OF A SUBSTANTIALLY ANHYDROUS LIQUID HYDROCARBON BY MEANS OF A CATALYST SYSTEM CONSISTING ESSENTIALLY OF AN ORGANOLITHIUM COMPOUND AND AN ORTHOESTER HAVING THE GENERAL FORMULA R2-C(-O-R3)(-O-R4)-O-R5 WHEREIN, R2 IS HYDROGEN OR A HYDROCARBON RADICAL AND R3, R4 AND R5 ARE HYDROCARBON RADICALS.
Inventors
- 👤 Akira Onishi
- 👤 Shiro Anzai
- 👤 Koichi Irako
- 👤 Ryota Fujio
- 👤 Yoshihiro Hayakawa
- 👤 Shoji Miyamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:57
CPC Classifications
C; C08; C08F; C08F236/00; C08F236/02; C08F236/04; C08F236/10
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) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |