Patents by Inventor Stefen Götzfried

Stefen Götzfried 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).

  • Rock drill head
    Patent number: 6845827
    Abstract: A drill head for rock drilling comprising cutting edges (1) made of hard material, which is detachably connected axially, over a bearing surface (3), with a drilling shaft (4) with at least one radially projecting driver blade (5a, 5b, 5c) by a bayonet-type connection slot (6a, 6b, 6c), wherein at least one connection slot (6a, 6b, 6c) is present, which forms two axially opposing undercuts (7a, 7b), within which the driver blade (5a, 5b, 5c) has limited axial movement.
    Type: Grant
    Filed: December 12, 2002
    Date of Patent: January 25, 2005
    Assignee: Hilti Aktiengesellschaft
    Inventors: Martin Richter, Udo Hauptmann, Stefen Götzfried, Werner Kleine