Process for the preparation of polyolefin
CA 2174976 C · Owner: Mitsui Petrochemical Industries, Ltd. · Inventors: Kawasaki, Masaaki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a process for the preparation of polyolefin by polymerizing an olefin in a polymerization system in the presence of a catalyst comprising A a metallocene compound of a transition metal of Group IVB of the periodic table, and, B an organoaluminum oxy-compound wherein the organoaluminum oxy-compound B is added to the polymerization system in the form of a slurry thereof in an aliphatic hydrocarbon or alicyclic hydrocarbon and the, polymerization is carried out in the presence of an aliphatic hydrocarbon diluent or an alicyclic hydrocarbon diluent.
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 January 22, 1993 and granted March 25, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 22, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 22, 2015.
- 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.