Method for coloring building materials using a cationic pigment dispersion
CA 2447669 C · Owner: Moore, James E. · Inventors: Rasmusen, Hans; Thorsson, Jorn R.; Moore, James E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A cationic dispersion which includes at least one pigment water, and at least , one , acid salt of a styrene maleimide imide resin in an amount effective to disperse the , organic pigment. A method for preparing the cationic dispersion includes (i) mixing, at , 500 to 10,000 rpm, at least one pigment; water; and either (a) at least one acid salt of a , styrene maleimide imide resin or (b) at least one styrene maleimide imide resin in , combination with at least one weak acid thereby forming a dispersion premix; , (ii) milling the dispersion premix in a mixter filled with ceramic metal or glass beads or , a period of time sufficient to reduce pigment agglomerates to primary particles …
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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 May 17, 2002 and granted November 15, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 17, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 17, 2024.
- 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
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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.