Patents by Inventor Robert W. Arfele

Robert W. Arfele 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).

  • Nine blade drill bit
    Patent number: D403003
    Type: Grant
    Filed: March 5, 1998
    Date of Patent: December 22, 1998
    Assignee: Dresser Industries, Inc.
    Inventors: Robert W. Arfele, George A. Espiritu, Ed R. Martin, Jr.