Method of making mixed ziegler-natta/metallocene catalysts
CA 2465570 A1 · Owner: Shirodkar, Pradeep, P. · Inventors: Santana, Robert, L.; Mink, Robert I.; Schurzky, Kenneth, G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Methods of making mixed Ziegler-Natta/metallocene catalysts are disclosed. The methods include slurrying a dehydrated support in a hydrocarbon solvent adding a dialkylmagnesium compound, then adding a non-metallocene group 4 or 5 metal compound, followed by adding a metallocene an alumoxane, and optionally , an aklyl aluminum compound and an electron donor compound followed by drying , the product. The alumoxane is added in an aromatic solvent.
Read the whole patent
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 October 3, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 3, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 3, 2024.
- 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.