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:
May. 23, 2017
Filed:
Feb. 24, 2012
Takamasa Kawai, Handa, JP;
Kazunari Takahashi, Handa, JP;
Hiroshi Chikatsune, Handa, JP;
Masaki Yoshikawa, Handa, JP;
Jun Takano, Handa, JP;
Takuya Nagahama, Houston, TX (US);
Masateru Ueta, Handa, JP;
Osamu Sonobe, Chiba, JP;
Takamasa Kawai, Handa, JP;
Kazunari Takahashi, Handa, JP;
Hiroshi Chikatsune, Handa, JP;
Masaki Yoshikawa, Handa, JP;
Jun Takano, Handa, JP;
Takuya Nagahama, Houston, TX (US);
Masateru Ueta, Handa, JP;
Osamu Sonobe, Chiba, JP;
JFE STEEL CORPORATION, Tokyo, JP;
Abstract
A threaded joint for steel pipes that includes a pin and a box. The pin has an externally threaded portion, a nose, and a shoulder portion. The box has an internally threaded portion, a sealing surface, and a shoulder portion. The outer circumferential surface of the nose of the pin has an outward convex curved shape, and the sealing surface of the box has a tapered shape. Additionally, the cross-sectional area of the pin at a seal point is 35% or more of the cross-sectional area of an original pipe portion corresponding to an unprocessed portion of the pin, the seal point being a portion on the pin that first comes into contact with the sealing surface of the box when the pin and the box are joined.