Polymer composition useful as viscosity index improver
CA 1307364 C · Owner: Sanyo Chemical Industries, Ltd. · Inventors: Nomura, Tomio; Takigawa, Shoji; Teranishi, Kiyoshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A polymer composition or concentrate comprising : (A) an olefinic copolymer, (B) a copolymer of olefins with a (meth)acrylate (C) a poly(meth)acrylate, and, (D) a surfactant which is poor solvent for both the components (A) and (C), and acts as a solubilizer or phase-stabilizer for the components (A) and (C), in combination with surface activity of the component (B) as a phase-stabilizer has lower viscosity even at high polymer content and is useful as a lubricating oil additive for improving the viscosity index.
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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
- Granted September 8, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 8, 2009.
- 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.