Patents by Inventor Bruce Stephen Mitchell

Bruce Stephen Mitchell 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).

  • Patent number: 6868903
    Abstract: A production tool for use in heavy oil production is provided. Operating to provide for better inflow of oil and sand to a bottom hole rotating pump, the production tool prevents sand up conditions and keeps the well cellar and the walls of the casing clean to ensure longer periods between workovers. The production tool has a cylindrical member with at least one helical fin extending substantially to the inner radius of the casing, and a gear reducer which drives the cylindrical member at a reduced rotation from input from the rotor of the bottom hole rotating pump. The rotational motion of the cylindrical member in conjunction with the sense of the helical fin cause bore effluence to move to the intake of the rotating pump, effecting constant inflow.
    Type: Grant
    Filed: November 15, 2002
    Date of Patent: March 22, 2005
    Inventors: Bruce Stephen Mitchell, Donald James Almond
  • Publication number: 20030066687
    Abstract: A well bore pressure containment device is provided. Operating as a single stripping and containment device compatible with a wide range of tool string and tubing sizes, the containment device may be integrated with rotating pressure control systems, and be used during completion and work over operations. The containment device has a spool, and a flexible bladder extending about the interior of the spool. The bladder may be controllably deformed to seal against a tool string passing through the device using an inwardly directed pressure, which preferably is exerted by a fluid in the interstitial space between the spool and the bladder.
    Type: Application
    Filed: October 7, 2002
    Publication date: April 10, 2003
    Inventor: Bruce Stephen Mitchell