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. 18, 2016
Filed:
Oct. 16, 2012
Jfe Steel Corporation, Tokyo, JP;
Masaki Yoshikawa, Tokyo, JP;
Takuya Nagahama, Tokyo, JP;
Hiroshi Chikatsune, Tokyo, JP;
Jun Takano, Tokyo, JP;
Takamasa Kawai, Tokyo, JP;
Masateru Ueta, Tokyo, JP;
Kazunari Takahashi, Tokyo, JP;
Nobuhiko Morioka, Tokyo, JP;
JFE Steel Corporation, Tokyo, JP;
Abstract
In the threaded joint for pipes, a coating having a Vickers hardness greater than or equal to 310 is formed on a threaded portion of the box and an inner face of the box corresponding to a seal portion. The seal interference amount ratio δ/D of the seal portion in a pipe circumferential direction is greater than or equal to 0.002, where D is a seal diameter defined as an outside diameter of the pin at a seal point that is a point on the outer peripheral face of the nose of the pin at which the outer peripheral face first comes into contact with the inner peripheral face of the nose of the box and δ is an interference amount defined as an amount by which the outside diameter at the seal point is reduced by the box when the pin and the box are threadedly connected with each other.