Patents by Inventor Chung-Min Chein

Chung-Min Chein 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).

  • Shoe structure with nails to extend out or retract in by kicking forwards or backwards
    Patent number: 4821434
    Abstract: The shoe has spikes which can be extended and retracted by T-shaped rail members which are actuated by respectively impacting the front or the rear of the shoe sole against a solid target such as a wall or road surface.
    Type: Grant
    Filed: February 19, 1988
    Date of Patent: April 18, 1989
    Inventor: Chung-Min Chein