Catalyst for polymerization of vinyl compound
CA 2105690 A1 · Owner: Tosoh Corporation · Inventors: Yamada, Satoru; Yano, Akihiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
of Disclosure:, A novel catalyst for polymerization of a vinyl compound is provided which comprises, as a catalyst component (A), an organometal complex represented by General Formula (1) below:, (1), where Cp1 and Cp2 are independently a substituted or unsubstituted cyclopentadienyl group; R1 is a group selected from alkylene groups or arylalkylene groups having 1 to 20 carbons, dialkylsillylene groups dialkylgermanylene groups, alkylphosphinediyl groups or, alkylimino groups, and R1 crosslinking Cp1 and Cp2 together; m is 0 or 1; M is titanium, zirconium or, hafnium; and R2, R3, and R4 are independently hydrogen a, hydrocarbon group of 1 to 12 carbons an alkoxy group, or, an aryloxy …
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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 September 8, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 8, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 8, 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.