Process for preparing ultra-high molecular weight polyethylene
CA 2096782 A1 · Owner: Nippon Oil Co. Ltd. · Inventors: Shiraishi, Takeichi; Okamoto, Mitsuo; Matsuura, Kazuo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
According to the present invention there is provided a process for preparing an ultra-high molecular weight polyethylene superior in fluidity, having a high bulk density, a small average particle diameter and a narrow particle size distribution and substantially free from formation of coarse particles. In a process for preparing an ultra-high molecular weight polyethylene, using a catalyst comprising a solid catalyst component and an organometallic compound there is, used as the said solid catalyst component a material obtained by contacting the following components A and B with each other:, A a reaction product resulting from the reaction of a magnesium halide and a compound of the general …
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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 May 21, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 21, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 21, 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.