Patents by Inventor Jean Duret

Jean Duret 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).

  • Patent number: 4798157
    Abstract: The drogue (1) has a steering system (8) which may be assisted by a rudder (4). The drogue is steered by varying the towing angle by applying a longitudinal differential force to the rope (6). The drogue is highly stable. It is capable of effectively countering the heeling torque of a boat (5). It may also be used for performing experiments at a distance from acoustic interference from the towing vessel. It may also be used for steering the course of a free balloon above the waves within a downwind sector.
    Type: Grant
    Filed: January 30, 1987
    Date of Patent: January 17, 1989
    Inventor: Jean Duret
  • Patent number: 4550937
    Abstract: Threaded pipe joint in which tip of the male member engages shoulder within the female member and any excess in the outer diameter of the male member over the corresponding inner diameter of the female member is so small that the hoop stress in the female member does not exceed the axial stress therein.
    Type: Grant
    Filed: December 10, 1979
    Date of Patent: November 5, 1985
    Assignee: Vallourec S.A.
    Inventor: Jean Duret
  • Patent number: 4494777
    Abstract: A threaded pipe joint including male and female sections, each with corresponding closed angle threading. Cooperating abutments are on the respective male and female sections. The closed angle threading diminishes in height in the region adjacent the abutments, which limit axial movement of the sections with respect to each other and thereby prevent movement which would permit the closed angle threads to separate.
    Type: Grant
    Filed: May 23, 1984
    Date of Patent: January 22, 1985
    Assignee: Vallourec, S.A.
    Inventor: Jean Duret
  • Patent number: 4493946
    Abstract: A device for connecting together the outer conductors of two coaxial pairs with coaxial conductors (3) and outer conductors (4), said device including two metal half-shells (11) with chamfered ends (10) which are provided with longitudinal slots, said half-shells being disposed between the ends of the outer conductors, a sleeve (6) which covers said half-shells and one of whose ends is provided with a tapping (7), and a clamping screw 8 which is screwed onto the end of the sleeve so that by means of a conical ring (9), it clamps one end of each half-shell. The inside of the other end of the sleeve is machined to give it a frusto-conical profile (19) whose conical shape matches that of the corresponding ends (20) of the half-shells. Application to connecting two lengths of coaxial cable or one coaxial cable to the coaxial lead of a repeater.
    Type: Grant
    Filed: March 9, 1983
    Date of Patent: January 15, 1985
    Assignee: Les Cables de Lyon
    Inventor: Jean Duret
  • Patent number: 4398756
    Abstract: Separable joint for oil well pipe in which both the male and female members have a cylindrical threaded section adjacent a frusto-conical thread section, and the female member has an internal shoulder against which the end of the male member seals.
    Type: Grant
    Filed: November 13, 1981
    Date of Patent: August 16, 1983
    Assignee: Vallourec, S. A.
    Inventors: Jean Duret, Charles Soulier, Georges Trouillet