Patents by Inventor John Francis Sullivan

John Francis Sullivan 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).

  • Enzyme-activated oxidative process for coloring hair
    Patent number: 3957424
    Abstract: An enzyme-based oxidative process for coloring hair wherein the hair is exposed to a solution having a pH of about 4 to about 10 and containing hydrogen peroxide, soybean peroxidase enzyme and one or more oxidation dye precursors.
    Type: Grant
    Filed: September 13, 1974
    Date of Patent: May 18, 1976
    Assignee: The Procter & Gamble Company
    Inventors: Eugene Zeffren, John Francis Sullivan