US3780139A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Segment copolymers of 1,3-dienes and aromatic vinyl compounds
Assignee: Bayer AG
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Filing: 1971-10-18
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Granted: 1973-12-18
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Expires: 1991-10-18
Abstract
Abstract A PROCESS FOR CONTINUOUSLY PRODUCING SEGMENT COPOLYMERS FROM 1,3-DIENES AND AROMATIC VINYL COMPOUNDS IN THE ABSENCE OF A SOLVENT WITH LITHIUM ORGANIC COMPOUNDS AS CATALYSTS BVY USING A SELF-CLEANING MULTIPLE SHAFT SCREW EXTRUDER AS THE POLYMERIZATION VESSEL.
Inventors
- 👤 H Sutter
- 👤 K Nothen
- 👤 F Haas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:51
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) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |