Patents by Inventor Donald M. Underwood

Donald M. Underwood 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).

  • Metal-to-metal sealing pipe swivel joint
    Patent number: 5044672
    Abstract: A metal-to-metal sealing pipe swivel joint especially useful with a subsea well completion system to pivotally interconnect the subsea wellhead to a lay-away flowline, the swivel joint having an annular seal element with metallic sealing surfaces and inner and outer tubular elements, also with metallic sealing surfaces, that can be moved into or withdrawn from sealing engagement with the seal element sealing surfaces.
    Type: Grant
    Filed: March 22, 1990
    Date of Patent: September 3, 1991
    Assignee: FMC Corporation
    Inventors: Harold B. Skeels, Christopher E. Cunningham, Edmund M. Mouret, Donald M. Underwood, Michael J. Krenek