Patents by Inventor Edward E. Ludwig

Edward E. Ludwig 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).

  • Two wheeled roller skate
    Patent number: 4844492
    Abstract: A two wheel roller skate has a roller that has two distinct surfaces consisting of a central part that is a curved surface and matching right and left frusto conical sections that have an angle that equals the degree of arc in the central part measured from the central point of the central part's arc providing greatly improved maneuverability.
    Type: Grant
    Filed: March 28, 1988
    Date of Patent: July 4, 1989
    Inventor: Edward E. Ludwig
  • Roller skate
    Patent number: D292729
    Type: Grant
    Filed: February 15, 1985
    Date of Patent: November 10, 1987
    Inventor: Edward E. Ludwig