US3607851A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization of conjugated diolefins
Assignee: Bridgestone Firestone Inc
•
Filing: 1969-04-24
•
Granted: 1971-09-21
•
Expires: 1989-04-24
Abstract
Abstract Conjugated diolefins, with or without vinyl aromatic comonomers, are polymerized using a catalyst which is a combination of ROK and R''K, where R is an alkyl or alkenyl radical, and R'' is an alkenyl radical. Polymerization of 1,3-butadiene in this system results in a product which is primarily trans-1,4-polybutadiene, with essentially no cis-1,4-polybutadiene.
Inventors
- 👤 Lawrence E Forman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:10
CPC Classifications
C; C08; C08F; C08F36/00; C08F36/02; C08F36/04
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |