Patents by Inventor Thomas K. Washburn

Thomas K. Washburn 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).

  • Undercut stator for a positive displacment motor
    Patent number: 9393648
    Abstract: A Moineau style stator includes a stator tube having a plurality of rigid helical lobes formed on an inner surface thereof. The helical lobes define a major internal tube diameter that is greater than a pass through diameter of the tube such that the major diameter undercuts the pass through diameter of the tube. A major liner diameter may also be less than the pass through diameter so as to provide a suitable interference fit between rotor and stator.
    Type: Grant
    Filed: March 30, 2010
    Date of Patent: July 19, 2016
    Assignee: SMITH INTERNATIONAL INC.
    Inventors: Lance D. Underwood, William D. Murray, Thomas K. Washburn
  • UNDERCUT STATOR FOR A POSITIVE DISPLACMENT MOTOR
    Publication number: 20110243774
    Abstract: A Moineau style stator includes a stator tube having a plurality of rigid helical lobes formed on an inner surface thereof. The helical lobes define a major internal tube diameter that is greater than a pass through diameter of the tube such that the major diameter undercuts the pass through diameter of the tube. A major liner diameter may also be less than the pass through diameter so as to provide a suitable interference fit between rotor and stator.
    Type: Application
    Filed: March 30, 2010
    Publication date: October 6, 2011
    Applicant: SMITH INTERNATIONAL, INC.
    Inventors: Lance D. Underwood, William D. Murray, Thomas K. Washburn