Patents by Inventor Kevin B. Stevenson

Kevin B. Stevenson 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).

  • Method and compositions for authenticating a product or document
    Patent number: 5595590
    Abstract: A method and compositions for authenticating a document or article comprises applying a mixture of a carrier, a leuco dye and an activator to a surface of a document or article, wherein the leuco dye and activator react in response to a rubbing force applied to the surface to change color and wherein the activator is at least one selected from the group consisting of amidophenol, anilides with hydroxyl groups and benzoamides with hydroxyl groups and authenticating the document or article by applying a rubbing force to the surface to effect a color change.
    Type: Grant
    Filed: May 31, 1995
    Date of Patent: January 21, 1997
    Assignee: Nocopi Technologies, Inc.
    Inventors: Blake Q. Belding, JoAnn Silknitter, Kevin B. Stevenson, Terry W. Stovold