Vinyl chloride resin composition
CA 2014071 C · Owner: Hasegawa, Toshihiko · Inventors: Matsuba, Kuniyoshi; Hasegawa, Toshihiko; Hosoi, Hideki
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 comprising: (1) 100 parts by weight of a vinyl chloride resin and (2) 0.1 to 30 parts by weight of a two-stage polymer said polymer (2) being prepared by emulsion-polymerizing 60 to 95 parts by weight of a monomer mixture (A) of 50 to 95 % by weight of methyl methacrylate 5 to 50 % by, weight of an alkyl methacrylate with a C2 to C8 alkyl group and 0 to 20 % by weight of a vinyl monomer to give a polymer latex and then polymerizing 40 to 5 parts by weight of a monomer mixture (B) of 20 to 80 % by weight of an alkyl acrylate and/or an alkyl methacrylate other than methyl methacrylate, 80 to 20 % by weight of methyl methacrylate and 0 to 20 % by weight of a …
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 6, 1990 and granted June 30, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 6, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 6, 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.