Patents by Inventor Ming-Zen Liu

Ming-Zen Liu 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).

  • Puzzle device
    Patent number: 5114148
    Abstract: A puzzle device has a round body including at least two intersecting endless runways formed around its external surface and a plurality of intersecting points formed in the intersecting runways; and a plurality of game pieces slidably retained in the runways. The game pieces are moved from one runway to the other runway via the intersecting points so as to position the game pieces in a desired arrangement.
    Type: Grant
    Filed: July 9, 1991
    Date of Patent: May 19, 1992
    Inventor: Ming-Zen Liu