Patent US3769233A successfully refreshed from Google Patents.
US3769233A
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US
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Process for the preparation of a ziegler-natta type catalyst
Assignee: Solvay SA
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Filing: 1971-03-24
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Granted: 1973-10-30
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Expires: 1991-03-24
Abstract
Abstract A CATALYST, USEFUL FOR THE POLYMERIZATION OF OLEFINS, WHICH CONTAINS VIOLET TICL3 AND HAS A HIGH STEROSPECIFICITY IS PREPARED BY CONTACTING BROWN TICL3 WITH TICL4 AT A TEMPERATURE BELOW 100*C.
Inventors
- 👤 J Hermans
- 👤 P Henrioulle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:53
CPC Classifications
C; C08; C08F; C08F10/00; C01; C01G; C01G23/00; C01G23/02; C01G23/026; Y; Y10; Y10S; Y10S526/00; Y10S526/903; Y10S526/904; Y10S526/905
Claims Analysis
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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) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |