Patents Assigned to Dominion Colour Corporation
  • Water-insoluble violet benzimidazolone monoazo pigments
    Patent number: 6706864
    Abstract: Water-insoluble violet benzimidazolone monoazo pigments of the formula: wherein R1, R2 and R3 each represent hydrogen, chlorine, bromine, methyl, methoxy, ethoxy, nitro or a group of the formula —COOR with R being hydrogen, methyl or ethyl, and R4 represents hydrogen, chlorine, bromine, methyl, methoxy, ethoxy or nitro group. Due to the presence of two 5-membered heterocyclic rings in the molecule, these pigments display very high thermoresistance and excellent fastness to migration.
    Type: Grant
    Filed: February 20, 2003
    Date of Patent: March 16, 2004
    Assignee: Dominion Colour Corporation
    Inventors: Mark J. Vincent, Helen Skelton, Jaroslav Slupecky, Justin Yee
  • Heat stable orange laked monoazo pigment
    Patent number: 6387170
    Abstract: An orange laked monoazo pigment has the following formula (I): wherein M is an alkaline metal selected from the group consisting of calcium, barium, strontium, magnesium and manganese.
    Type: Grant
    Filed: August 28, 2000
    Date of Patent: May 14, 2002
    Assignee: Dominion Colour Corporation
    Inventors: Alan Gray, Henry Lui, Dorothy-Grace Manarang-Pena
  • Water-insoluble yellow monoazo pigment
    Patent number: 6150509
    Abstract: A water-insoluble yellow monoazo pigment has the following formula (I): ##STR1##
    Type: Grant
    Filed: November 12, 1999
    Date of Patent: November 21, 2000
    Assignee: Dominion Colour Corporation
    Inventors: Alan Gray, Henry Lui, Dorothy-Grace Manarang