US3812088A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization of vinyl aromatic compounds
Assignee: International Synthetic Rubber Co Ltd
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Filing: 1971-11-30
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Granted: 1974-05-21
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Expires: 1991-11-30
Abstract
Abstract A PROCESS FOR THE ANIONIC POLYMERIZATION OF AT LEAST ONE VINYL AROMATIC MONOMER SELECTED FROM STYRENE AND HYDROCARBYL SUBSTITUTED STYRENES COMPRISING POLYMERIZING THE MONOMER IN THE PRESENCE OF A CATALYST COMPRISING A METAL OF GROUP 1-A OF THE PERIODIC TABLE OR A HYDRIDE OR HYDROCARBYL THEREOF CHARACTERIZED IN THAT THE FEEDSTOCK FOR THE POLYMERIZATION IS THE HYDROCARBON EFFLUENT OF A DEHYDROGENATION REACTION COMPRISING AT LEAST 5% BY WEIGHT OF SAID MONOMER AND IN THAT AT LEAT A PROPORTION OF THE HEAT OF POLYMERIZATIOM IS RETAINED IN THE REACTION MIXTURE WHEREBY THE TEMPERATURE OF THE MIXTURE IS CAUSED TO RISE AND IS FOR AT LEAST PART OF THE REACTION TIME IN EXCESS OF 100*C.
Inventors
- 👤 D Bennett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:58
CPC Classifications
C; C08; C08F; C08F12/00; C08F12/02; C08F12/04
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) | 1977-05-20 | 1977-11-19 | 1978-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-20 | 1981-11-19 | 1982-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-20 | 1985-11-19 | 1986-05-21 | $7700.00 | Window Closed / Lapsed |