Patents Examined by John M. Kilioyno
  • Oxidation hair dyes comprising m-phenylenediamine derivatives as coupling components
    Patent number: 4684371
    Abstract: This invention is directed to m-phenylenediamine derivatives and salts thereof and to compositions of the developer-coupler type of the dyeing of hair, consisting essentially of m-phenylenediamine derivatives or salts thereof as coupling components and, as developer components, conventional components used in oxidation dyes.
    Type: Grant
    Filed: December 19, 1985
    Date of Patent: August 4, 1987
    Assignee: Henkel Kommanditgesellschaft auf Aktien
    Inventors: Gunther Konrad, Norbert Maak, Edgar Lieske