Patents by Inventor James A. Bartkowiak

James A. Bartkowiak 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 and method for mining hard rock
    Patent number: 5662387
    Abstract: A cutter head for use in the removal of hard rock. The cutter head combines a standard cutting member, such as button bits or wedge-lock cutters, with cutting blades having a diamond cutting surface. The cutting blades cutting surface is positioned above the standard cutting members so that in operation, the cutting blades form grooves in the rock face and the standard cutting members fracture the rock adjacent the grooves through tensile forces.
    Type: Grant
    Filed: November 8, 1995
    Date of Patent: September 2, 1997
    Inventor: James A. Bartkowiak