Patents by Inventor Dana R. Henry

Dana R. Henry 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: 4005863
    Abstract: Tennis rackets having racket strings which are not round. The strings are provided with a cross-section of a geometrical shape such as to provide each string with two or more edges. The strings are also provided with a helical twist along their length during their formation by extrusion; they are also provided with approximately one-half of a helical twist per unit of length corresponding to the distance between adjacent cross-over points of the strings and at such points there is surface to surface rather than edge to edge engagement.
    Type: Grant
    Filed: October 4, 1974
    Date of Patent: February 1, 1977
    Inventor: Dana R. Henry