Patents by Inventor Stephen E. Isaak

Stephen E. Isaak 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).

  • Treasure hunt game
    Patent number: D333323
    Type: Grant
    Filed: August 22, 1990
    Date of Patent: February 16, 1993
    Inventors: Mark A. Nelson, Stephen E. Isaak