Patents by Inventor Philippe Thouvenin

Philippe Thouvenin 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-dyeing compositions based on para-phenylenediamine and ortho-aminophenol
    Patent number: 4370142
    Abstract: The invention relates to compositions for hair dyeing which contain, as the oxidative dye-stuff, in a cosmetically acceptable medium, para-phenylenediamine and ortho-aminophenol, or their cosmetically acceptable salts, in a ratio para-phenylenediamine/ortho-aminophenol which is such that, after the addition of an equal volume of hydrogen peroxide of 20 volumes strength and application to the hair for 30 minutes, no Bandrowsky's base can be detected in the oxidizing dyeing composition.The compositions according to the invention make it possible to impart background colorations to the hair without the formation of Bandrowsky's base.
    Type: Grant
    Filed: July 8, 1980
    Date of Patent: January 25, 1983
    Assignee: L'Oreal
    Inventors: Andree Bugaut, Philippe Thouvenin, Jean Cotteret