Patents by Inventor William E. Schiefer

William E. Schiefer 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: 4367871
    Abstract: An articulable training device, particularly adapted for continuously reinforcing proper stroking or serving techniques necessary to successfully play various racquet sports such as tennis, is disclosed herein and comprises a tennis racquet having an elongated handle member and a member which includes a ball rebounding surface or net face at one end thereof. The device for connecting said handle and said member having a ball rebounding surface for free relative pivotal movement about an axis transverse to the longitudinal dimension of said handle and generally parallel with said ball rebounding surface. Further included are means for limiting the range of relative pivotal movement of said members to thereby minimize the likelihood of accidental injury to the player using the racquet.
    Type: Grant
    Filed: July 25, 1980
    Date of Patent: January 11, 1983
    Inventor: William E. Schiefer