Patents by Inventor Donald M. Garrett, Jr.

Donald M. Garrett, Jr. 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).

  • Anti-rotation method and apparatus for limiting rotation of cementing plugs
    Patent number: 7080687
    Abstract: An apparatus for preventing or limiting the rotation of cementing plugs in a casing string during drillout. The apparatus includes an outer housing with a sleeve disposed therein. The sleeve has an inner surface configured to engage cementing plugs received therein to cause an interference fit. The sleeve will hold the cementing plugs when rotational forces, such as drilling forces, are applied so that during drillout, rotation of the cementing plug is prevented or is at least limited.
    Type: Grant
    Filed: January 15, 2004
    Date of Patent: July 25, 2006
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Charles A. Butterfield, Jr., Henry E. Rogers, Seth R. Moore, Donald M. Garrett, Jr., Ronald J. Holubec