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:
Aug. 01, 2017
Filed:
Apr. 18, 2011
Takashi Okada, Wakayama, JP;
Keiichi Nakamura, Wakayama, JP;
Masaaki Sugino, Nishinomiya, JP;
Suguru Yamaguchi, Amagasaki, JP;
Takashi Okada, Wakayama, JP;
Keiichi Nakamura, Wakayama, JP;
Masaaki Sugino, Nishinomiya, JP;
Suguru Yamaguchi, Amagasaki, JP;
NIPPON STEEL & SUMITOMO METAL CORPORATION, Tokyo, JP;
VALLOUREC OIL AND GAS FRANCE, Aulnoye-Aymeries, FR;
Abstract
In a threaded joint for steel pipes comprising a pin () and a box (), each having a threaded portion (or), a sealing surface (or), and a shoulder surface (or), the sealing surface () of the pin () is formed by a tapered surface, and the sealing surface () of the box () is formed by a first curved surface portion with a large radius of curvature in the range of 15-120 mm, a tapered surface portion, and a second curved surface portion with a large radius of curvature again in the range of 15-120 mm.