Patents by Inventor David E. Knibbe

David E. Knibbe 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).

  • Offshore apparatus for carrying out operations in an offshore well
    Patent number: 3957112
    Abstract: A marine riser or conductor that extends between a floating drilling vessel and an underwater wellhead is provided with buoyancy means in the form of small-diameter, stiff-walled fluidtight tubes arranged around the outer wall of the marine riser.
    Type: Grant
    Filed: November 14, 1974
    Date of Patent: May 18, 1976
    Assignee: Shell Oil Company
    Inventors: David E. Knibbe, David C. S. Pitham