Patent US3565875A successfully refreshed from Google Patents.
US3565875A
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Polymerization process and catalyst system therefor
Assignee: Covestro International SA
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Filing: 1969-03-10
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Granted: 1971-02-23
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Expires: 1989-03-10
Abstract
Abstract PROCESS FOR POLYMERIZING OLELFINS, DIOLEFINS AND ALKYLENE OXIDES IN THE PRESENCE OF A CATALYST SYSTEM COMPRISED OF AN IRON COMPLEX, A TRIALKYL ALUMINUM COMPOUND AND A BIDENATE LIQUID CAPABLE OF BOTH PI ($) AND SIGMA ($) BONDING TO FORM A FIVE OR SIX-MEMBERED RING.
Inventors
- 👤 John E Bozik
- 👤 Harold E Swift
- 👤 Ching-Yong Wu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:08
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/02; C08G65/04; C08G65/06; C08G65/08; C08G65/10; C08G65/12; C08F; C08F10/00; C08F36/00; C08F36/02; C08F36/04; C08F4/00; C08F4/06; C08F4/12
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) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |