Treatment process
CA 2007503 C · Owner: Tioxide Group Plc · Inventors: Livsey, Ian; Parry, Rachael Louise
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process of coating or encapsulating an inorganic powder is described in which the powder, preferably a pigment is dispersed in an aqueous medium and, an ethylenically unsaturated monomer is polymerized in the presence of the powder and while subjecting the reaction mixture to ultrasonic vibrations. The monomer is present in an amount not exceeding 200% by weight of the powder and preferably is an acrylate or methacrylate. The powder has a cationic charge on its surface which can be generated by treatment of the surface with, preferably an aluminium salt.
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 January 10, 1990 and granted January 21, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 10, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 10, 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.