Patents by Inventor Robert H. Erhardt

Robert H. Erhardt 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).

  • Process for forming steel roller bearings
    Patent number: 6874234
    Abstract: A process for forming a metal, preferably steel, roller bearing comprising the steps of providing a hardened steel cylindrical blank having end face surfaces, a lateral surface defining an outer diameter, and a centered circular bore whose surface defines an inner diameter; hard turning the surface of the bore to a specified inner diameter; and hard turning the lateral surface of the blank to achieve, in a single set up, a final form of the bearing having a specified outer diameter with a radial crown.
    Type: Grant
    Filed: May 23, 2000
    Date of Patent: April 5, 2005
    Assignee: Delphi Technologies, Inc.
    Inventors: William Dean Bauman, David W. Koetsier, Robert H. Erhardt