Patents by Inventor Ernst R. Krueger, V

Ernst R. Krueger, V 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).

  • Tractor with improved valve system
    Patent number: 7121364
    Abstract: A hydraulically powered tractor adapted for advancement through a borehole including an elongate body, aft and forward gripper assemblies, and a valve control assembly housed within the elongate body. The aft and forward gripper assemblies are adapted for selective engagement with the inner surface of the borehole. The valve control assembly includes a gripper control valve for directing pressurized fluid to the aft and forward gripper assemblies. The valve control assembly also includes a propulsion control valve for directing fluid to an aft or forward power chamber for advancing the body relative to the actuated gripper assembly. Aft and forward mechanically actuated valves may be provided for controlling the position of the gripper control valve by detecting and signaling when the body has completed an advancement stroke relative to an actuated gripper assembly.
    Type: Grant
    Filed: December 23, 2003
    Date of Patent: October 17, 2006
    Assignee: Western Well Tool, Inc.
    Inventors: Phil Mock, Ernst R. Krueger, V, Duane Bloom, N. Bruce Moore