US3790545A
Expired / Lapsed
US
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Preparation of high cis-content polypentenamer polymers
Assignee: Goodrich Corp
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Filing: 1972-05-18
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Granted: 1974-02-05
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Expires: 1992-05-18
Abstract
Abstract POLYPENTENAMER POLYMERS HAVING HIGH CIS-CONTENT ARE PREPARED IN A PROCESS COMPRISING POLYMERIZING CYCLOPENTENE MONOMER WITH A CATALYST COMPRISING AN ORGANOALUMINUM COMPOUND AND A TUNGSTEN SALT AT A TEMPERATURE OF FROM ABOUT -40*C. TO ABOUT -60*C. AND BELOW. THE TUNGSTEN SALT IS ADDED AFTER THE ORGANOALUMINUM COMPOUND AND AT POLYMERIZATION TEMPERATURES. THE POLYMERS ARE SULFUR-VULCANIZABLE AND HAVE GOOD LOW TEMPERATURE PROPERTIES.
Inventors
- 👤 R Minchak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:29
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)
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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) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |