Patents by Inventor Franz J. Kupper

Franz J. Kupper 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 the extrusion of tubular bodies of synthetic-resin material
    Patent number: 4137028
    Abstract: An apparatus for the extrusion of tubular bodies of synthetic-resin material and especially large-diameter pipes, in which the die for forming the tube is connected to an extrusion press and includes an outer member and an inner member between which the material is forced. On the outer member there is provided a calibrating sleeve and the die carries a radioactive thickness-measuring means.
    Type: Grant
    Filed: January 24, 1978
    Date of Patent: January 30, 1979
    Assignee: Reifenhauser KG
    Inventors: Paul Reitemeyer, Franz J. Kupper