Patents by Inventor Liung M. Wu

Liung M. Wu 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).

  • Patent number: 5197741
    Abstract: An electrically lit chess piece includes a chess body which is coupled to a transparent cap at the top end and contains an internal battery housing. The battery housing includes a bulb positioned under the transparent cap and a magnet having springs at the bottom section. When the chess piece is placed on a metallic chessboard, the magnet is displaced in a downward direction and the bulb is lit. When the chess piece is removed from the chessboard, the magnet is pulled in an upward displacement by the springs and disconnects an electrical circuit for turning the light bulb off.
    Type: Grant
    Filed: May 19, 1992
    Date of Patent: March 30, 1993
    Inventor: Liung M. Wu