Olefin polymerization catalyst
CA 2072430 A1 · Owner: Fujita, Takashi · Inventors: Kitagawa, Kazuyo; Fujita, Takashi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An olefin polymerization catalyst which is obtained by contacting the following components (A) and (B): component (A): a product of contacting the following components (A1) and (A2):, component (A1): polyolefin powder having specific values of pore diameter, pore volume, average pore diameter and average particle diameter, component (A2): a solid component for a Ziegler catalyst comprising titanium, magnesium and a halogen as the essential components;, component ( B ): an organoaluminum compound. The supporting state of the catalyst is improved and, a contaminant-free polymer having a satisfactorily large particle diameter without the lowering of the activity or the stereoregularity of the …
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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 June 26, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 26, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 26, 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.