专利名称：Threaded joint for metal tubes with internal
coating
发明人：Thierry Noel申请号：US08/772465申请日：19961223公开号：US05906399A公开日：19990525
摘要：The invention concerns threaded joints for tubes, having a layer intended inparticular to protect the tubes and the joints from corrosion or to improve the conditionsfor a flow of fluids. The joint comprises two tubular threaded components each providedwith a radial annular surface. The internal wall of the components and the annularsurfaces are covered with a layer. The shape of the annular surfaces is such that in thescrewed state those surfaces are partially in abutment contact at their external portion,their internal portion creating a progressive opening zone which is at least partially filledby the layers of the two components.
申请人：VALLOUREC OIL & GAS
代理机构：Oblon, Spivak, McClelland, Maier & Neustadt, P
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