Patents by Inventor Jerome C. Hanna

Jerome C. Hanna 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).

  • Twist drill
    Patent number: 7101125
    Abstract: A twist drill including a cutting tip having a front flank face, a substantially cylindrical tool body extending rearwardly from the cutting tip, and a shank. The tool body includes a rotational axis therethrough and at least one flute formed on an outer peripheral surface thereof and extending to the front flank face. The at least one flute includes a first helical portion opening to the front flank face and a second helical portion extending from the rear end of the first helical portion toward the rear portion of the tool body. The second helical portion twists in a direction opposite of the first helical portion.
    Type: Grant
    Filed: December 17, 2003
    Date of Patent: September 5, 2006
    Assignee: Kennametal Inc.
    Inventors: Bernhard W. Borschert, Jerome C. Hanna, Tilo Krieg, Larry R. Meenan, Michael D. Shultz