Water-insoluble violet benzimidazolone monoazo pigments
CA 2440535 A1 · Owner: Dominion Colour Corporation · Inventors: Skelton, Helen; Slupecky, Jaroslav; Yee, Justin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Water-insoluble violet benzimidazolone monoazo pigments of the formula: wherein R1, R2 and R3 each represent hydrogen chlorine, bromine, methyl, methoxy, ethoxy vitro, or a group of the formula -COOR with R being hydrogen methyl or ethyl, and R4 , represents, hydrogen chlorine, bromine, methyl, methoxy, ethoxy or vitro group. Due to the presence of two, 5-membered heterocyclic rings in the molecule these pigments display veryhigh , thermoresistance and excellent fastness to migration.
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 September 11, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 11, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 11, 2025.
- 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.