Patent US3752797A successfully refreshed from Google Patents.
US3752797A
Expired / Lapsed
US
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Mixed catalyst for the polymerization of alpha olefins
Assignee: Hoechst AG
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Filing: 1971-11-05
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Granted: 1973-08-14
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Expires: 1991-11-05
Abstract
Abstract PROCESS FOR THE POLYMERIZATION OF A-OLEFINS BY MEANS OF A MIXED CATALYST COMPOSED OF A PHOSPHORIC ACID-NALKYLAMIDE, A CYCLOPOLYALKENE, A HALOGEN COMPOUND OF TRIVALENT TITANIUM AND A HALOGEN-FREE ORGANO-ALUMINIUM COMPOUND. PRODUCTS OF IMPROVED STEREOSPECIFICITY ARE OBTAINED WITH A GOOD CATALYST-TIME-YIELD.
Inventors
- 👤 W Gordon
- 👤 K Rust
- 👤 E Schrott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:39
CPC Classifications
C; C08; C08F; C08F10/00; Y; Y10; Y10S; Y10S526/00; Y10S526/901; Y10S526/902; Y10S526/903
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) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |