Patents by Inventor Charles R. Hahn

Charles R. Hahn 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).

  • Hair coloring composition and its method of use
    Patent number: 4873079
    Abstract: A temporary or semipermanent hair coloring composition comprising an aqueous vehicle having incorporated therein a hair coloring component, said composition also containing as a cosolvent for the hair colorant from less than about 15% by weight of a diol selected from the group consisting of aliphatic hydrocarbon diols having from 5 to 8 carbon atoms and bis (hydroxy-alkyl) cyclohexanes having from 7 to 14 carbon atoms.
    Type: Grant
    Filed: December 14, 1987
    Date of Patent: October 10, 1989
    Assignee: Clairol Incorporated
    Inventors: Charles R. Hahn, Warren B. Shapiro