Patents by Inventor Robert Lee Stewart

Robert Lee Stewart 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).

  • Laundry pre-soak compositions
    Patent number: 3950277
    Abstract: Compositions and methods for removing oily triglyceride stains from fabrics employing a lipase enzyme and a lipase activator selected from the group consisting of naphthalene sulfonates, certain polyoxyalkylene derivatives of ethylenediamine and certain acylamino acid salts. The lipase-plus-activator compositions are utilized to pre-soak soiled fabrics, which are subsequently laundered using conventional household equipment.
    Type: Grant
    Filed: July 25, 1973
    Date of Patent: April 13, 1976
    Assignee: The Procter & Gamble Company
    Inventors: Robert Lee Stewart, Homer Wallace McCune, Francis Louvaine Diehl