Patents by Inventor Philippe H. Schaeffer

Philippe H. Schaeffer 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).

  • Marine riser
    Patent number: 3981357
    Abstract: An improved marine riser is described which is comprised of a plurality of conduit sections joined together end to end. Buoyancy cans for retaining a compressed gas are flexibly connected to the riser at selected locations along its length and form a fluid tight seal therewith.
    Type: Grant
    Filed: February 3, 1975
    Date of Patent: September 21, 1976
    Assignee: Exxon Production Research Company
    Inventors: James M. Walker, William T. Ilfrey, Philippe H. Schaeffer