Patents by Inventor Oswald Martens

Oswald Martens 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 welding rolled seams
    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