Patents by Inventor Stuart D. Clouston

Stuart D. Clouston 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).

  • Method and apparatus for freezing large pipe
    Patent number: 5836167
    Abstract: Apparatus and method for freezing large pipe plugs, including in particular subsea applications, wherein the apparatus includes a jacket adapted to encircle a section of large pipe, a recycling refrigeration unit having said jacket connected as an evaporation chamber and, for subsea applications, a submersible housing enclosing a portion of such refrigeration unit; the method including landing a submersible recycling refrigeration unit on or proximate a pipe and cycling, and preferably reverse cycling, a refrigerant therethrough.
    Type: Grant
    Filed: May 8, 1996
    Date of Patent: November 17, 1998
    Assignee: Nowsco Well Service Ltd.
    Inventors: Stuart D. Clouston, Paul S. Goodwin