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:
Jul. 18, 2017
Filed:
Oct. 30, 2014
Jfe Steel Corporation, Tokyo, JP;
Takamasa Kawai, Chita, JP;
Kazunari Takahashi, Chita, JP;
Hiroshi Chikatsune, Chita, JP;
Masaki Yoshikawa, Chita, JP;
Jun Takano, Chita, JP;
Takuya Nagahama, Chita, JP;
Masateru Ueta, Houston, TX (US);
Tsuyoshi Yoneyama, Chita, JP;
Hideo Sato, Chita, JP;
Haruhiko Seki, Chita, JP;
JFE Steel Corporation, , JP;
Abstract
A threaded joint for heavy-walled oil country tubular goods can both ensure sealability and prevent galling in a state where a high external pressure is also applied to the threaded joint in addition to a high compressive force. A surface of a pin side forming a seal portion and a surface of a box side forming a seal portion are formed into a convex curved surface and a tapered surface, respectively. A seal thickness tof the pin is 15 mm or less, a shape parameter t/D (D: outer diameter of a pin raw pipe portion) is 0.045 or more, and a complete thread length ratio L/t (L: complete thread length of the pin, t: wall thickness of the pin raw pipe portion) is 4.0 or less.