Patents by Inventor John D. Gugel

John D. Gugel 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: 3981504
    Abstract: A molded, plastic tennis racket frame is described which is constructed of a combination of glass fiber reinforcement and carbon fiber reinforcement to provide a low specific gravity composite when incorporated in resins which are reinforced by these materials and to permit construction of a tennis racket having a general shape of conventional wooden rackets. The tennis racket is constructed as a unitary piece utilizing foamed resins reinforced with the glass fibers and carbon fibers. Specific weight percentages of glass fibers and carbon fibers are designated for maximum strength, flexibility and good playing characteristics.
    Type: Grant
    Filed: November 25, 1974
    Date of Patent: September 21, 1976
    Assignee: PPG Industries, Inc.
    Inventor: John D. Gugel