Modified polyolefin particles and process for preparation thereof
CA 2003563 C · Owner: Toyota, Akinori · Inventors: Toyota, Akinori; Kioka, Mamoru; Inagaki, Hajime
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for preparation of modified polyolefin particles which comprises contacting and reacting (A) 100 wt. parts of polyolefin particles with (B) 0.01 to 50 wt. parts of at least one ethylenic unsaturated compound selected from the group consisting of carboxyl group-containing ethylenic un-saturated compounds or their carboxylic anhydrides or their carboxylic acid derivatives, hydroxyl group-containing ethylenic unsaturated compounds amino-group-containing ethylenic unsaturated compounds and glycidyl group-containing ethylenic unsaturated compounds, in the presence of (C) more than 10 wt. parts to not more than 50 wt parts, of a medium of a liquid state at ordinary temperature whose …
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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 November 22, 1989 and granted September 21, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 22, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 22, 2011.
- 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.