The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 12, 2021
Filed:
Nov. 06, 2018
Nippon Steel Corporation, Tokyo, JP;
Vallourec Oil and Gas France, Aulnoye-Aymeries, FR;
Yousuke Oku, Tokyo, JP;
Masaaki Sugino, Tokyo, JP;
Nippon Steel Corporation, Tokyo, JP;
Vallourec Oil and Gas France, Aulnoye-Aymeries, FR;
Abstract
A threaded connection for steel pipe with improved sealability against the internal and external pressures is provided. A threaded connectionincludes a pinand a box. The pinincludes a male thread, a nose, a pin shoulder surface, and a pin sealing surface. The boxincludes a female thread, a box shoulder surface, and a box sealing surface. The box sealing surfacehas a seal point SP on the taper surfacelocated at the midpoint thereof as determined along the direction of the pipe axis CL. The distance Lbetween the tip of the noseand the seal point SP as measured in the direction of pipe axis CL is 13 mm or larger. The shoulder angle α between the pin or box shoulder surfaceorand a plane VP perpendicular to the pipe axis CL is 2 to 13 degrees. The ratio T/Tof the wall thickness Tof the box to the wall thickness Tof the pinas measured at the seal point SP is 1.7 or higher.