Patents by Inventor Calortscher, Gaudenz

Calortscher, Gaudenz 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: 5452970
    Abstract: Flat drill bit for drilling holes in wood, comprising a plate (12) with two longitudinal sides (16,17), two main radial edges (14,15) and a pilot point with two converging pilot edges (18,19), where main radial edges, pilot edges and short lateral edges (24,26) being short portions of the longitudinal sides all have positive rake angle, produced by grooves parallel to the edges facing forwards during rotation. For larger diameters the pilot point has two converging pilot edges and two parallel sides (27,28).
    Type: Grant
    Filed: April 13, 1994
    Date of Patent: September 26, 1995
    Assignee: Sandvik AB
    Inventors: Erik Sundstrom, Calortscher, Gaudenz