Patents by Inventor Clyde D. Durrett

Clyde D. Durrett 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: 5297833
    Abstract: An apparatus for gripping a down hole tubular for support and rotation, or a string of such tubulars, includes a body element adapted to be rotated at high torques either by a top head drive or a rotary table of an earth drilling machine. Gripping elements are mounted in a central cavity of the body element, and each gripping element includes a lower gripping portion shaped to engage a tapered shoulder of a length of drill pipe to support the drill pipe and an upper gripping portion shaped to engage the tool joint of the drill pipe to rotate the drill pipe. First guides are secured between the body element and the lower gripping portions in the central cavity, and these first guides are oriented to approach one another toward a lower portion of the body element. Second guides are secured between the upper and lower gripping portions, and these second guides are oriented to approach one another at an acute angle with respect to the axis.
    Type: Grant
    Filed: February 25, 1993
    Date of Patent: March 29, 1994
    Assignee: W-N Apache Corporation
    Inventors: Clyde A. Willis, Clyde D. Durrett