Patents by Inventor Franz-Josef Hartmann

Franz-Josef Hartmann 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).

  • Patent number: 4640115
    Abstract: In order to increase output of pipe straightening devices, there is provided a driving unit between a preparatory station for the pipes and a feeding station which advances the pipes from the preparatory station in axial direction one after the other in the feeding station. The feeding station includes a succession of rotation symmetrical guiding elements supported for rotation about axes which extend parallel to the feeding path for the pipes. The guiding bodies prevent striking of unbalanced pipes against the feeding unit and permit axial feeding of the pipes in a straightening station.
    Type: Grant
    Filed: July 3, 1985
    Date of Patent: February 3, 1987
    Assignee: Benteler-Werke AG
    Inventors: Franz-Josef Hartmann, Heinz Hefendehl
  • Patent number: 3996444
    Abstract: A rotatable shaft has a roller electrode mounted on it for rotation therewith. A transformer and a rectifier are structurally integrated to form a unit which is also mounted on the shaft for rotation with it, and serve to convert high-voltage low-amperage net current into low-voltage high-amperage DC current. Slip rings are mounted on the shaft to transmit electrical current to the unit for supply to the roller electrode.
    Type: Grant
    Filed: February 3, 1975
    Date of Patent: December 7, 1976
    Assignee: Benteler -Werke Aktiengesellschaft Werk Neuhaus
    Inventors: Helmut Benteler, Franz-Josef Hartmann, Oswald Martens, Helmut Schulz