Process for producing polyolefin
CA 2040486 C · Owner: Tosoh Corporation · Inventors: Naito, Yutaka; Soga, Kazuo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Process for producing a polyolefin through polymerization of .alpha.-olefin in the presence of a catalyst comprising a component A composed of at least one compound selected from halogen compounds and oxygen-containing compounds of rhodium and ruthenium and a component B composed of at least one of organometallic compounds of Groups I to III of the periodic table, and process for producing ethylene-vinyl acetate copolymer through copolymerization of ethylene with vinyl acetate in the presence of the above catalyst.
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 April 15, 1991 and granted October 7, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 15, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 15, 2013.
- 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.