Patents Examined by Anne-Marie Koss
  • Coupler for use in oxidative hair dyeing
    Patent number: 6409773
    Abstract: Couplers for hair coloring compositions for oxidative dyeing of hair are compounds of the formula at least one coupler comprising a compound of the formula (1): wherein R is selected from of C1 to C2 alkyl and hydroxyethyl, R1 and R2 are each independently selected from the group consisting of C1 to C5 alkyl, C3 to C6 cycloalkyl, C1 to C5 alkoxy, C1 to C5 hydroxyalkyl, C1 to C5 hydroxyalkoxy, or R1 and R2 together with the carbon atom to which they are attached form a C3 to C6 cycloalkyl group.
    Type: Grant
    Filed: December 14, 2000
    Date of Patent: June 25, 2002
    Assignee: Clairol Incorporated
    Inventors: Mu-Ill Lim, Yuh-Guo Pan, Margaret Popp