US3634384A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization catalysts
Assignee: Covestro International SA
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Filing: 1969-05-05
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Granted: 1972-01-11
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Expires: 1989-05-05
Abstract
Abstract THERE ARE DISCLOSED NOVEL POLYMERIZATION CATALYSTS PREPARED BY REACTING MAGNESIUM HYDROXYCHLORIDE WITH A HYDROCARBON-SOLUBLE COMPLEX OF A TITANIUM OR VANADIUM TETRAHLIDE WITH AN ALKYL ALUMINUM COMPOUND SUCH AS ALUMINUM TRIALKYL OR DIALKYL ALUMINUM HALIDE, AND THEN MIXING THE REACTION PRODUCT WITH AN ORGANOMETALLIC COMPOUND OR HYDRIDE OF A GROUP U TO III METAL. THE CATALYSTS ARE PARTICULARLY EFFECTIVE IN THE POLYMERIZATION OF ETHYLENE TO THE HOMOPOLYMER, POLYETHYLENE, AND IN THE COPOLYMERIZATION OF ETHYLENE WITH PROPYLENE OR OTHER HIGHER ALPHAOLEFINS AND/OR WITH DIOLEFINS.
Inventors
- 👤 Ermanno Susa
- 👤 Adolfo Mayr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:11
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) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |