US3707520A
Expired / Lapsed
US
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Polymers of cyclopentene obtained by polymerizing to a predetermined conversion and adding mono or diolefin thereto
Assignee: Bayer AG
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Filing: 1970-03-09
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Granted: 1972-12-26
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Expires: 1990-03-09
Abstract
Abstract TWO-STAGE PROCESS FOR PRODUCING ECYLOPENTENE POLYMERS, WHEREIN CYCLOPENTENE IS POLYMERISED IN A SOLVENT IN THE PRESENCE OF A METAL-ORGANIC MIXED CATALYST TO A CONVERSION OF 40 TO 90% BY WEIGHT, AN OLEFIN OR DIOLEFIN IS ADDED AND POLYMERISATION IS COMPLETED.
Inventors
- 👤 Gotifried Pampus
- 👤 Josef Witte
- 👤 Gunter Marwede
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:22
CPC Classifications
C; C08; C08G; C08G61/00; C08G61/02; C08G61/04; C08G61/06; C08G61/08
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) | 1975-12-26 | 1976-06-26 | 1976-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-26 | 1980-06-26 | 1980-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-26 | 1984-06-26 | 1984-12-26 | $7700.00 | Window Closed / Lapsed |