Polyvinyl chloride resin composition
CA 2046517 C · Owner: Matsumoto, Koji · Inventors: Matsumoto, Koji; Osuka, Masahiro; Uno, Naomi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A polyvinyl chloride resin composition having a superior in falling weight impact resistance stress-whitening resistance and optical characteristics comprising a formulation of 100 parts by weight of a polyvinyl chloride resin and 2 to 40 parts by weight of a multi-stage copolymer obtained by polymerizing a resin component formable monomers in the range of from more than 30 parts by weight to 50 parts by weight said, resin component formable monomer being composed of a ratio of 25 to 55% by weight of methyl methacrylate 2, to 15% by weight of an alkyl acrylate (alkyl group having 1 to 8 carbon atoms) and 30 to 60% by weight of an aromatic vinyl monomer in the presence of from 50 parts by …
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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 July 9, 1991 and granted December 28, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 9, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 9, 2013.
- 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.