Star polymers and compositions thereof
CA 2584744 C · Owner: Visger, Daniel · Inventors: Price, David; Johnson, John R.; Visger, Daniel
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention provides a composition comprising: (a) a star polymer comprising: (i) a core portion comprising a polyvalent (meth) acrylic monomer oligomer or polymer thereof or a polyvalent divinyl non-acrylic monomer oligomer or polymer thereof; and (ii) at leat two arms of polymerized alkyl (meth)acrylate ester; and (b) an oil of lubricating viscosity wherein the , core portion further comprises a functional group of formula (I): -CH2- C(R1)(C(=O)A)-Y- wherein R1 is hydrogen a linear or branched alkyl group , containing 1 to 5 carbon atoms; A is nitrogen or oxygen; and Y is a free radical leaving group selected from the gruop consisting of one or more atoms or groups of atoms which …
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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 October 21, 2005 and granted September 24, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 21, 2025.
- Certificates of supplementary protection extend only drug patents, and it isn't classified as one.
- 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.