Patents by Inventor John D. Lindley

John D. Lindley 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).

  • Milling tool
    Patent number: 5181564
    Abstract: A tool for milling a down-hole casing or tubing comprising a tubular body rotatable about its longitudinal axis and having a longitudinal passage therethrough. Means is provided at a first end of the cylindrical body for connection to a drive means to rotate the body. The first end forms the upper end of the body in the working position. At least one first blade extends outwardly from the cylindrical body and has a lowermost cutting edge extending upwardly from its innermost portion at an angle of from about 2.degree. to about 60.degree. to a radial plane perpendicular to said longitudinal axis, and at least one second blade extends outwardly from the cylindrical body and has a lowermost cutting edge extending downwardly from its outermost portion at an angle of from about 2.degree. to about 60.degree. to a radial plane perpendicular to said longitudinal axis.
    Type: Grant
    Filed: October 8, 1991
    Date of Patent: January 26, 1993
    Assignee: Weatherford-Petco, Inc.
    Inventors: John D. Lindley, Colin R. Mackenzie, Mark E. Hall