Patents by Inventor Richard W. Severson

Richard W. Severson 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).

  • Arithmetic board game
    Patent number: 4017080
    Abstract: A competitive board game in which two playing boards are used and a set of 117 tiles for placement upon the playing boards, the playing boards having spaces where the tiles are to be placed, some of the tiles having arithmetic addition, subtraction, multiplication and division symbols while other of the tiles have the numerical digits, the game using arithmetic so to be played.
    Type: Grant
    Filed: September 17, 1975
    Date of Patent: April 12, 1977
    Inventor: Richard W. Severson