Patents Represented by Attorney Henry M. Feifreisen

Find this attorney in the Justia Lawyer Directory

  • Method of making a seamless hot-finished steel pipe, and device for carrying out the method
    Patent number: 8166792
    Abstract: In a method of making a seamless hot-finished steel pipe a billet heated to a shaping temperature is pierced by a first shaping to a thick-walled hollow ingot which subsequently undergoes a radial forging process using an internal tool inserted in the hollow ingot and at least two forging jaws of a forging machine. The forging jaws act on the outer surface area of the hollow ingot, wherein the hollow ingot is turned and axially advanced in a clocked manner in the idle stroke phase of the forging jaws.
    Type: Grant
    Filed: October 25, 2005
    Date of Patent: May 1, 2012
    Assignee: V & M Deutschland GmbH
    Inventors: Christoph Prasser, Rolf Kümmerling, Stefan Wiedenmaier, Pierre Lefebvre, Rupert Wieser, Robert Koppensteiner