Patent US3703567A successfully refreshed from Google Patents.
US3703567A
Expired / Lapsed
US
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Process for the production of segment copolymers
Assignee: Bayer AG
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Filing: 1970-07-13
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Granted: 1972-11-21
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Expires: 1990-07-13
Abstract
Abstract A PROCESS FOR THE CONTINUOUS SOLVENT-FREE PRODUCTION OF SEGMENT COMPOLYMERS OF 1,3-DIENES AND AROMATIC VINYL COMPOUNDS WITH ORGANOLITHIUM INITIATORS IN SELFCLEANING TWIN-SHAFT OR MULTIPLE-SHAFT SCREWS, WHEREIN A REACTION MIXTURE OF A 1,3-DIOLEFIN, AN AROMATIC VINYL COMPOUND AND A PREPOLYMER CAPABLE OF FURTHER POLYMERISATION PREDOMINANTLY BUILT UP FROM THE 1,3-DIOLEFIN, IS DELIVERED TO THE TWIN-SHAFT OR MUTIPLE-SHAFT SCREW EXTRUDER.
Inventors
- 👤 Hubert Sutter
- 👤 Manfred Beck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:39
CPC Classifications
C; C08; C08F; C08F297/00; C08F297/02; C08F297/04
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) | 1975-11-21 | 1976-05-22 | 1976-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-21 | 1980-05-22 | 1980-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-21 | 1984-05-22 | 1984-11-21 | $7700.00 | Window Closed / Lapsed |