Patents by Inventor Walter Lempach

Walter Lempach 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).

  • Drill bit
    Patent number: 6021857
    Abstract: A masonry drill bit having an active diameter of D, comprising a shaft and a tip 1 for engaging a workpiece, wherein the tip 1 is formed with a plurality of stepped portions shaped to cut a workpiece as the drill bit rotates. By virtue of the drill bit tip 5 configuration as described and claimed herein, a masonry drill bit 1 having improved performance is provided.
    Type: Grant
    Filed: September 17, 1997
    Date of Patent: February 8, 2000
    Assignees: Black & Decker Inc., Plansee Tizit
    Inventors: Rudi Birk, Werner Ferstl, Ronald Huber, Walter Lempach