Patents by Inventor Donald Leroy Wilke

Donald Leroy Wilke 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).

  • Composition with a metal-complexing dye and surfactant
    Patent number: 7550422
    Abstract: The present invention relates to a composition with a metal-complexing dye and surfactant for giving a color change when in contact with selected metal ions.
    Type: Grant
    Filed: October 4, 2005
    Date of Patent: June 23, 2009
    Assignee: The Procter & Gamble Company
    Inventors: Giorgia Sgargetta, Stacie Ellen Hecht, Jichun Shi, Mark Robert Sivik, Donald Leroy Wilke