Bimetallic complexes and polymerization catalysts therefrom
CA 2303519 A1 · Owner: The Dow Chemical Company · Inventors: Li, Liting; Patton, Jasson T.; Marks, Tobin J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Group 3-6 or Lanthanide metal complexes possessing two metal centers catalysts derived therefrom by combining the same with strong Lewis acids Bronsted acid salts, salts containing a cationic oxidizing agent or subjected to bulk electrolysis in the presence of compatible inert non-coordinating , anions and the use of such catalysts for polymerizing olefins diolefins , and/or acetylenically unsaturated monomers are disclosed.
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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 August 28, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 28, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 28, 2020.
- 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
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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.