Patents by Inventor Robert D. Harrel

Robert D. Harrel 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: 4620802
    Abstract: A guide for use in a string of sucker rods rotated in tubing in a borehole, each guide being formed of an elongated, upright, cylindrical coupling body having female threads at the upper and lower ends for attachment in a string of sucker rods, and including a plurality of at least three recesses in the body cylindrical surfaces, there being a recess in at least each 120.degree. quadrant around the body, an axle received in each recess, the axis of each axle being parallel and spaced from the body longitudinal axis, and a roller rotatably received on each axle, the periphery of each roller extending exteriorly of the external cylindrical surface of the coupling body, the rollers being conical shaped on each end, and the roller serving to contact the interior wall of tubing in which the sucker rod string is rotated to prevent wear of the tubing and the sucker rod string.
    Type: Grant
    Filed: August 9, 1985
    Date of Patent: November 4, 1986
    Assignee: Tellin, Incorporated
    Inventor: Robert D. Harrel