Vallourec Sa

Jean Duret

Charles Soulier

Georges Trouillet

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.

Joint for steel tubes

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.

Closed angle thread pipe joint

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.

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Aulnoye-Aymeries, France

Jean Duret