Siloxane star-graft polymers, ceramic powders coated therewith and method of preparing coated ceramic powders
CA 2250962 C · Owner: Nanophase Technologies Corporation · Inventors: Brotzman, Richard W. Jr.; Aikens, John H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A coated ceramic powder comprises a plurality of ceramic particles and a siloxane star-graft coating polymer encapsulating at least a portion of the particles. The coating polymer comprises Si(w,x,y,z) where w, x, y and z are , the mole percent tetrafunctional trifunctional, difunctional and , monofunctional monomeric units respectively, and wherein w is about 20-100 and x, y and z are about 0-30, 0-50 and 0-10 respectively, and at least one , of x, y and z is greater than zero. A method of preparing a coated ceramic powder comprises the steps of a) polymerizing a tetrafunctional siloxane monomer and at least one of a trifunctional siloxane monomer a difunctional , siloxane monomer and …
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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 March 28, 1997 and granted June 3, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 28, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 28, 2019.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.