US3787377A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous process of copolymerizing butadiene and styrene
Assignee: Bridgestone Firestone Inc
•
Filing: 1971-12-16
•
Granted: 1974-01-22
•
Expires: 1991-12-16
Abstract
Abstract BUTADIENE AND STYRENE WAS COPOLYMERIZED IN A SOLUTION WHICH IS DEPT IMTACT AS IT IS PASSED THROUGH REACTOR MEANS IN A CONTINUOUS PROCESS,, USING BUTYLLITHIUM AS THE INITIATOR, WITH SDIUM OR POTASSIUM T-AMYLATE ORMENTHOLATE AS A MODIFIER TO PRODUCE A CONSTANT-COMPOSITION COPOLYMER RUBBER. A GEL SUPPRESANT IS USE IN THE POLYERIZATION. THE MICROSTRUCTRE OF THE POLYBUTADIENE IN THE COPOLYMER IS NOT GREATLY DIFFERENT FROM THAT OF THE COMPLYMER PRODUCED BY BUTYLLITHIUM ALONE.
Inventors
- 👤 A Halasa
- 👤 A Oberster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:03
CPC Classifications
C; C08; C08F; C08F236/00; C08F236/02; C08F236/04; C08F236/10
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) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |