US3281375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization catalyst
Assignee: Hercules Powder Co
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Filing: 1961-10-09
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Granted: 1966-10-25
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Expires: 1981-10-09
Abstract
No abstract record available.
Inventors
- 👤 James Vandenberg Edwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:20
CPC Classifications
C; C08; C08F; C08F10/00; C08F2/00; C08F2/36; C08F36/00; C08F36/02; C08F36/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
THE METHOD OF PREPARNG CATALYSTS FOR OLEFIN POLYMMERIZATION WHICH COMPRISES MIXING A SOLUTION OF AN ALKYL ALUMINUM COMPOUND SELECTED FROM THE GROUP CONSISTING OF TRIETHYL ALUMINUM AND DIETHYLALUMINUM HALIDE WITH A SOLUTION OF TITANIUM TETRACHLORIDE TO FORM A SLURRY OF A PRECIPITATE CONTAINING A REDUCED MODIFICATION OF TITANIUM TETRACHLORIDE AND MIXING SAID PRECIPITATE, WHOSE POLYMERIZATION ACTIVITY IS REDUCED BY STORAGE PRIOR TO CONTACY WITH OLEFINS, WITH AN ALKYL ALUMINUM COMPOND HAVING A RELATIVELY LOW REDUCING ACTIVITY, DIFFERING FROM SaID ALKYL ALUMINUM COMPOUND PREVIOUSLY UTILIZED AND SELECTED FROM THE GROUP CONSISTING OF ETHYLENE ALUMINUM HALIDES, AND DIMETHYL ALUMINUM HALIDE TO FORM A POLYMERIZATION CATALYST OF INCREASED ACTIVITY.
Claim 2
Independent Claim
106 words
THE METHOD OF PREPARNG CATALYSTS FOR OLEFIN POLYMMERIZATION WHICH COMPRISES MIXING A SOLUTION OF AN ALKYL ALUMINUM COMPOUND SELECTED FROM THE GROUP CONSISTING OF TRIETHYL ALUMINUM AND DIETHYLALUMINUM HALIDE WITH A SOLUTION OF TITANIUM TETRACHLORIDE TO FORM A SLURRY OF A PRECIPITATE CONTAINING A REDUCED MODIFICATION OF TITANIUM TETRACHLORIDE AND MIXING SAID PRECIPITATE, WHOSE POLYMERIZATION ACTIVITY IS REDUCED BY STORAGE PRIOR TO CONTACY WITH OLEFINS, WITH AN ALKYL ALUMINUM COMPOND HAVING A RELATIVELY LOW REDUCING ACTIVITY, DIFFERING FROM SaID ALKYL ALUMINUM COMPOUND PREVIOUSLY UTILIZED AND SELECTED FROM THE GROUP CONSISTING OF ETHYLENE ALUMINUM HALIDES, AND DIMETHYL ALUMINUM HALIDE TO FORM A POLYMERIZATION CATALYST OF INCREASED ACTIVITY.
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) | 1969-10-24 | 1970-04-25 | 1970-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-24 | 1974-04-25 | 1974-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-24 | 1978-04-25 | 1978-10-25 | $7700.00 | Window Closed / Lapsed |