US3781257A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolymerization of cyclopentene with polycyclic polyolefines
Assignee: Bayer AG
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Filing: 1971-12-02
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Granted: 1973-12-25
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Expires: 1991-12-02
Abstract
Abstract A PROCESS FOR THE PREPARATION OF COPOLYMERS FROM CYCLIC MONOOLEFINS AND CYCLIC POLYOLEFINS BY POLYMERIZATION IN AN INERT ORGANIC SOLVENT IN THE PRESENCE OF AN ORGANO-METALLIC MIXED CATALYST, CHARACTERIZED IN THAT THE CATALYST USED IS AN ORGANO-METALLIC MIXED CATALYST OF (A) A REACTION PRODUCT OF A TUNGSTEN HALOGEN COMPOUND WITH AN EPOXIDE OR A HALOGEN SUBSTITUTED AND (B) AN ORGANIC ALUMINUM COMPOUND.
Inventors
- 👤 G Pampus
- 👤 N Schon
- 👤 J Witte
- 👤 G Marwede
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:16
CPC Classifications
C; C08; C08G; C08G61/00; C08G61/02; C08G61/04; C08G61/06; C08G61/08; C08F; C08F236/00; C08F236/02; C08F236/04
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |