Patents by Inventor Dan Bownes

Dan Bownes 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).

  • Downhole progressing cavity pump rotor valve
    Patent number: 5549160
    Abstract: An apparatus and method for plugging a tubing string of a fluid producing well below a sucker rod driven progressing cavity type pump uses a valve means inside of the tubing string below the pump, the valve means being actuatable by displacing the rotor of the pump axially within the stator by vertical movement of the sucker rod string. The valve means can comprise a valve seat fixed to the inside of the tubing below the rotor and a valve member fixed to the bottom end of the rotor and adapted to be brought into sealing engagement with the valve seat by downward movement of the rotor.
    Type: Grant
    Filed: May 27, 1994
    Date of Patent: August 27, 1996
    Assignee: National-Oilwell Canada Ltd.
    Inventors: Dan Bownes, Darren Wiltse