Vinyl chloride resin composition
CA 2065967 C · Owner: Mori, Hiroto · Inventors: Mori, Hiroto; Takaki, Akira; Hasegawa, Toshihiko
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A vinyl chloride resin composition having an improved impact resistance with a good transparency that the vinyl chloride resin itself possesses originally; which comprises (A) a graft copolymer prepared by (i) adding a water-soluble electrolyte to a butadiene polymer (a) (ii) adding a monomer mixture (b) containing mainly an aromatic vinyl monomer to polymerize (iii), adding a monomer mixture (c) containing mainly an alkyl methacrylate to polymerize and (iv), when desired adding, a monomer mixture (d) containing mainly an aromatic vinyl monomer.
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 14, 1992 and granted July 30, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 14, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 14, 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.