Polypropylene-polyester graft copolymer and production method thereof
CA 2050283 A1 · Owner: Kobayashi, Akira · Inventors: Inamori, Kikuo; Kobayashi, Akira; Sezume, Tadashi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention described relates to an effective compatibilizing agent for resin compositions of a polycarbonate and a polyolefin wherein the compatibilizing agent is a graft copolymer of modified polypropylene containing functional groups reacted with a polyester having an intrinsic viscosity of 0.5 to 1.8 and terminal carboxyl group present in an amount ranging from 10 to 100 meq/Kg.
Read the whole patent
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 April 11, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 11, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 11, 2012.
- 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.