Patents by Inventor Lief H. Steinberger

Lief H. Steinberger 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).

  • Method of forming a wood boring tool
    Patent number: 4012970
    Abstract: A boring tool for woodworking, and more particularly, a method of manufacturing the cutter head from a blank of cylindrical tool steel bar stock. The opposite ends of the cylindrical blank are turned to the desired radius for the cutter head, a transverse internally threaded recess is provided along a diameter of the blank at its mid-length, and the blank is machined to provide a central hub surrounding the recess with oppositely directed radial arms extending therefrom. The surface of the blank opposite the recess is faced to provide cutting edges, and a shank and lead screw are fixed in the recess.
    Type: Grant
    Filed: April 19, 1976
    Date of Patent: March 22, 1977
    Inventors: Doran M. Hintz, Lief H. Steinberger