Patent ID: 8534712

Claim:
A threaded joint for pipes comprising: a pin member and a box member, the pin member having an external thread configured to correspond to an internal thread of the box member; a thread form of the internal and external threads having generally dovetail-shaped profile with stab flanks and load flanks and flat roots and crests; wherein the internal threads are increasing in width in one direction on the box and the external threads are increasing in width in the other direction on the pin, so the roots, crests, and flanks of the threads move together and form seals that resist the flow of fluids between the seals; a fluoropolymer-based coating applied to specific regions of the internal and external threads; and a resin coating disposed in regions of the internal and external threads that are devoid of the fluoropolymer-based coating, wherein the resin coating is applied, subsequent to the fluoropolymer-based coating, to an overall thread surface of the internal and external threads; wherein the fluoropolymer-based coating and the resin coating are configured to form a single layer of substantially uniform thickness on the overall surface of the internal and external threads.