Patent US3658722A successfully refreshed from Google Patents.
US3658722A
Expired / Lapsed
US
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Catalysts for polymerization and process for their preparation
Assignee: Solvay SA
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Filing: 1969-06-27
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Granted: 1972-04-25
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Expires: 1989-06-27
Abstract
Abstract HIGHLY ACTIVE CATALYSTS FOR THE POLYMERIZATION OF OLEFINS RESULT FROM THE COMBINATION OF AN ORGANOMETALLIC COMPOUND AND A COMPLEX OBTAINED BY REACTING A HALOGENATING AGENT AND A TRANSITION METAL COMPOUND SELECTED FROM THE HALIDES, OXYHALIDES, HALOALKOXIDES, OXYALKOXIDES AND ALKOXIDES OF THE METALS OF GROUPS IVB, VB AND VIB OF THE PERIODIC TABLE WITH A SOLID SUPPORT COMPRISED OF AN OXYGENATED COMPOUND OF A BIVALENT METAL WHICH IS SUBSTANTIALLY ANHYDROUS AND IS SUBSTANTIALLY FREE OF HYDROXYL GROUPS.
Inventors
- 👤 Andre Delbouille
- 👤 Jean-Louis Derroitte
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:00
CPC Classifications
C; C08; C08F; C08F10/00
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) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |