Patents by Inventor Patrick J. Keyser

Patrick J. Keyser 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).

  • Latent image development system
    Patent number: 5485792
    Abstract: A latent image development system for producing a multicolor image on a substrate, includes in combination a substrate and dispenser. The substrate has a colorless or faintly colored latent multicolor image thereon, the latent image being formed by a plurality of different color former compositions, each including a Lewis base color former. The dispenser is adapted to development of the latent multicolor image on the substrate by marking thereover and reacting with a single color developer composition, the color developer composition being free of inorganic metallic salts and including a Lewis acid color developer operative for each of the color former compositions.
    Type: Grant
    Filed: July 7, 1995
    Date of Patent: January 23, 1996
    Assignee: Western Publishing Co., Inc.
    Inventors: Patrick J. Keyser, W. James Bousman, Robert W. Biemeck