Patents Assigned to Institut Francais du Petrole et Coflexip
  • Structure formed from a straight strip bent or corrugated and the method of manufacturing same
    Patent number: 4858653
    Abstract: A tubular structure is provided including an internal tube and an external tube which is formed from at least a straight strip bent or undulated, whose width is disposed substantially along at least a line normal to said tubes which it separates. It may be used, for example filled with an insulating lagging, by surrounding a pipe line or being adapted to the pipe line which then forms the internal tube.
    Type: Grant
    Filed: December 30, 1986
    Date of Patent: August 22, 1989
    Assignee: Institut Francais du Petrole et Coflexip
    Inventors: Michel Huvey, Anh T. Do, Jean-Michel Gerez, Lucien Le Gallais