Use of methylene-bridged derivatives of cyclopentadienyl dicarbollide complexes of titanium, zirconium and hafnium as polymerization catalysts
CA 2086448 A1 · Owner: Kao, Sun-Chueh · Inventors: Kao, Sun-Chueh; Brady Iii, Robert C.; Karol, Frederick J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure, Methylene bridged derivatives of novel cyclopentadienyl dicarbollide complexes of titanium zirconium and hafnium display high activity as ethylene polymerization catalysts in the absence of a cocatalyst. D-16749
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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 December 30, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 30, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 30, 2014.
- 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.