Patents by Inventor David S. Rowley

David S. Rowley 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).

  • Earth-boring drill bits
    Patent number: 4073354
    Abstract: The invention relates to the design of earth boring bits employing shaped preform cutters containing hard abrasive materials such as diamonds.
    Type: Grant
    Filed: November 26, 1976
    Date of Patent: February 14, 1978
    Assignee: Christensen, Inc.
    Inventors: David S. Rowley, Bruce H. Walker, Coy M. Fielder, Heino J. Rohde