Patents by Inventor Eckard Schlenker

Eckard Schlenker 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: 5178388
    Abstract: A racket for striking a ball, in particular a tennis racket includes a closed inner stringed frame which is at least partly enclosed by an outer support frame, with both frames being hingedly connected by at least two joints such that a local rotation of both frames relative to each other is permitted at the points of articulation. The joints are arranged relative to each other in such a manner that the inner frame is prevented from carrying out a rigid-body motion relative to the outer support frame and that both frames are prevented from carrying out a translational movement perpendicular to each other perpendicular to the racket plane.
    Type: Grant
    Filed: May 6, 1991
    Date of Patent: January 12, 1993
    Inventor: Eckard Schlenker