Patents Represented by Law Firm Asian Pacific International Patent & Trademark Office Patent & Trademark Office
  • 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