Patents by Inventor Karlheinz Guergen

Karlheinz Guergen 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).

  • Cutter head for rotary percussion drills
    Patent number: 4294319
    Abstract: A replaceable cutter head for rotary percussion drills having a pilot cutter on the end of a drill stem with a main cutter head surrounding the pilot cutter, the main cutter head having hammering/chipping cutters and milling cutters arranged along radial lines extending from the pilot cutter to the outer periphery of the main cutter head in alternate arrays, either along the radial cutter lines or on alternate radial cutter lines, or both.
    Type: Grant
    Filed: April 25, 1979
    Date of Patent: October 13, 1981
    Inventor: Karlheinz Guergen