Patents by Inventor Robert L. Gutzwiller

Robert L. Gutzwiller 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).

  • Racquet stringing machine
    Patent number: 4130278
    Abstract: A racquet stringing machine having automatically activated locking means and an improved tension means using a free hanging weight to apply a uniform tension to a racquet string through a wheel and drum which are connected to the weight and the racquet string, respectively.
    Type: Grant
    Filed: June 21, 1977
    Date of Patent: December 19, 1978
    Inventor: Robert L. Gutzwiller