Patents by Inventor Robert T. Duerigen

Robert T. Duerigen 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).

  • Coated roller chain pin
    Patent number: 5865021
    Abstract: The present invention relates to the case hardening, tempering and coating of a medium carbon alloy chain pin. A medium carbon alloy chain pin is provided and is case hardened to a selected radial depth. The case hardened chain pin is quenched and then tempered to introduce a gradient from the surface of the chain pin inwardly in carbon content and hardness. The chain pin is then coated with an electroless nickel and fluorinated carbon co-deposition to increase surface hardness.
    Type: Grant
    Filed: August 25, 1997
    Date of Patent: February 2, 1999
    Assignee: AMSTED Industries Incorporated
    Inventors: Robert T. Duerigen, Andrew J. Binford