Patents by Inventor Marcel M. Landwehr

Marcel M. Landwehr 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).

  • Subsea buoyancy systems
    Patent number: 11293566
    Abstract: A method of providing buoyancy to a subsea structure such as a pipeline bundle includes attaching to the structure a rigid elongate buoyancy tube that defines a floodable envelope. The envelope is arranged to contain a mass of buoyant macrospheres. Multiple openings penetrate a tubular wall of the buoyancy tube, in fluid communication with a void that extends between the macrospheres inside the tube. The void floods via the openings when the buoyancy tube is submerged, whereupon the macrospheres apply buoyant upthrust to the surrounding buoyancy tube and hence to the subsea structure to which the tube is rigidly attached.
    Type: Grant
    Filed: May 18, 2017
    Date of Patent: April 5, 2022
    Assignee: Acergy France SAS
    Inventors: Vincent Loentgen, Blaise Seguin, Marcel M. Landwehr
  • Subsea Buoyancy Systems
    Publication number: 20200318758
    Abstract: A method of providing buoyancy to a subsea structure such as a pipeline bundle comprises attaching to the structure a rigid elongate buoyancy tube that defines a floodable envelope. The envelope is arranged to contain a mass of buoyant macrospheres. Multiple openings penetrate a tubular wall of the buoyancy tube, in fluid communication with a void that extends between the macrospheres inside the tube. The void floods via the openings when the buoyancy tube is submerged, whereupon the macrospheres apply buoyant upthrust to the surrounding buoyancy tube and hence to the subsea structure to which the tube is rigidly attached.
    Type: Application
    Filed: May 18, 2017
    Publication date: October 8, 2020
    Inventors: Vincent Loentgen, Blaise Seguin, Marcel M. Landwehr