Patents by Inventor William D. Birdsong, Jr.

William D. Birdsong, Jr. 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).

  • Apparatus for manufacturing gas-filled balls with precision
    Patent number: 4313289
    Abstract: A tennis ball, racquet ball or other gas-filled ball is inflated with air or gas to such a degree that the ball will precisely balance a given applied force on the ball producing a given deflection of the ball. No attempt is made to achieve uniform internal pressure in inflated balls. The method instead attains a uniform and precise stress-strain relationship. The method of manufacturing produces substantially superior balls in terms of uniformity of play characteristics including bounce.
    Type: Grant
    Filed: November 13, 1980
    Date of Patent: February 2, 1982
    Inventor: William D. Birdsong, Jr.
  • Apparatus and method for manufacturing gas-filled balls with precision
    Patent number: 4251073
    Abstract: A tennis ball, racquet ball or other gas-filled ball is inflated with air or gas to such a degree that the ball will precisely balance a given applied force on the ball producing a given deflection of the ball. No attempt is made to achieve uniform internal pressure in inflated balls. The method instead attains a uniform and precise stress-strain relationship. The method of manufacturing produces substantially superior balls in terms of uniformity of play characteristics including bounce.
    Type: Grant
    Filed: June 26, 1978
    Date of Patent: February 17, 1981
    Inventor: William D. Birdsong, Jr.