Patents by Inventor Gertrud Ewald

Gertrud Ewald has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Coloring agent comprising transition metals
    Patent number: 6648925
    Abstract: The present invention relates to a composition for coloring keratin fibers and a method of using the same. The composition of the present invention contains at least one dye precursor, and one or more clathrate compounds that contain transition metal complexes.
    Type: Grant
    Filed: September 25, 2001
    Date of Patent: November 18, 2003
    Assignee: Henkel Kommanditgesellschaft auf Aktien (Henkel KGaA)
    Inventors: Bernd Mayer, Peter Kuhm, Horst Hoeffkes, Gertrud Ewald, Hans-Oscar Stephan, Melita Heller