Patents by Inventor Franz Pürstinger

Franz Pürstinger 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).

  • Calibrating device with at least one calibrating die
    Patent number: 6296464
    Abstract: The invention relates to a calibrating device with at least one calibrating die (24), which has die faces (66) against which an extruded object fed therethrough is applied, in particular a section having several cavities, a sealing device (60, 62) being provided to seal off a gap (56) in order to form a cavity (59) and, having been formed, this cavity (59) is evacuated to a negative pressure lower than the ambient pressure, means being provided to form the gap (56) before the first end face (53) of the calibrating die (24) and at least one of the terminal edges (67) of the die faces (66) having part end faces (76) to form the gap (56) with a gap width (65) smaller than 1.0 mm.
    Type: Grant
    Filed: April 16, 1999
    Date of Patent: October 2, 2001
    Assignee: C. A. Greiner & Söhne Gesellschaft m.b.H.
    Inventor: Franz Pürstinger