Patents Represented by Attorney, Agent or Law Firm Brain M. Bolam
  • Primary intermediates for oxidative coloration of hair
    Patent number: 6750355
    Abstract: Primary intermediates for hair coloring compositions for oxidative dyeing of hair are compounds of the formula (1): where R1 and R2 are each individually selected from a hydrogen atom, a C1 to C3 alkyl group, a C1 to C5 mono or dihydroxyalkyl group, phenyl or benzyl optionally substituted with an alkoxy group, or R1 and R2 together with the nitrogen atom to which they are attached form a piperazine, piperidine, imidazole, or morpholine ring.
    Type: Grant
    Filed: January 18, 2002
    Date of Patent: June 15, 2004
    Assignee: The Procter & Gamble Company
    Inventors: Mu-Ill Lim, Yuh-Guo Pan