Patents Examined by Venkatarman Balasubramanian
  • Cationic aminoanthraquinones, their use for dyeing keratinous fibers, dyeing compositions containing them and methods of dyeing
    Patent number: 6645259
    Abstract: Cationic aminoanthraquinones in which at least one cationic charge is delocalized on a 5-membered unsaturated polynitrogen-containing heterocycle, their use as a direct dye in dyeing compositions for keratinous materials, in particular for human keratinous fibers such as hair, dyeing compositions containing them, and dyeing methods using these compositions.
    Type: Grant
    Filed: July 9, 2002
    Date of Patent: November 11, 2003
    Assignee: L'Oreal S.A.
    Inventors: Alain Genet, Alain Lagrange