Supported olefin polymerization catalyst, its preparation and use
CA 2175702 C · Owner: Borealis Holding A/S · Inventors: Kallio, Kalle; Knuuttila, Hilkka; Palmqvist, Ulf
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Until now, olefin polymerization catalysts based on a metallocene an alumoxane and a support have been highly uneven in quality. A new process had now been developed for the preparation of a supported olefin polymerization catalyst wherein (a) a metallocene/activator, reaction product a solvent capable of dissolving it, and a porous support are brought into mutual contact and (b) the solvent is removed, and wherein step (a) is carried out so that the porous support is impregnated with an amount at maximum its pore volume of the metallocene/activator reaction product and solvent.
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed November 4, 1994 and granted December 31, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 4, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 4, 2016.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.