Patents by Inventor Jack S. Polonka

Jack S. Polonka 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).

  • Ceramic glaze including pearlescent pigment
    Patent number: 5783506
    Abstract: The present invention relates to a ceramic coating composition contains frit, suspending agent, binder, mica and pearlescent pigment and has a viscosity of about 10 to 50 second as measured by a Zahn cup with orifice diameter of 0.108 inch.
    Type: Grant
    Filed: January 31, 1997
    Date of Patent: July 21, 1998
    Assignee: Engelhard Corporation
    Inventors: Richard A. Eppler, Jack S. Polonka