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:
Mar. 31, 2015
Filed:
Feb. 24, 2012
Masaki Yoshikawa, Chita, JP;
Takuya Nagahama, Chita, JP;
Hiroshi Chikatsune, Chita, JP;
Jun Takano, Chita, JP;
Takamasa Kawai, Chita, JP;
Kazunari Takahashi, Chita, JP;
Masateru Ueta, Chita, JP;
Osamu Sonobe, Chiba, JP;
Masaki Yoshikawa, Chita, JP;
Takuya Nagahama, Chita, JP;
Hiroshi Chikatsune, Chita, JP;
Jun Takano, Chita, JP;
Takamasa Kawai, Chita, JP;
Kazunari Takahashi, Chita, JP;
Masateru Ueta, Chita, JP;
Osamu Sonobe, Chiba, JP;
JFE Steel Corporation, Tokyo, JP;
Abstract
Provided is a threaded joint for steel pipes having high sealability even under a bending load. In the threaded joint, when a pinand a boxare threadedly connected with each other, the outer peripheral face of a noseof the pin and the inner peripheral face of a nose of the box are in metal-to-metal contact with each other at a contact portion and the contact portion serves as a seal portion. A threaded portion, at which the externally threaded portionand the internally threaded portionare threadedly connected with each other, has a negative load flank angle α, shoulder portionsandhave a negative torque shoulder angle β, and the ratio L/dof a length L of the nose and a pipe outside diameter dis equal to or higher than 0.08.