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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.:

US 9752710 B1

PDFFull Text
Date of Patent:
Sep. 05, 2017

Filed:

Nov. 16, 2012

Tubular threaded joint having improved high torque performance

Applicants:

Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;

Vallourec Oil and Gas France, Aulnoye-Aymeries, FR;

Inventors:

Kunio Goto, Tokyo, JP;

Yuji Tanaka, Tokyo, JP;

Yasuhiro Yamamoto, Tokyo, JP;

Assignees:

NIPPON STEEL & SUMITOMO METAL CORPORATION, Tokyo, JP;

VALLOUREC OIL AND GAS FRANCE, Aulnoye-Aymeries, FR;

Attorney:

Clark & Brody

Primary Examiner:

David E Bochna

Int. Cl.
CPC ...
F16L 15/08 (2006.01); F16L 15/04 (2006.01); F16L 15/06 (2006.01); F16L 58/18 (2006.01); F16L 15/00 (2006.01); C10M 169/04 (2006.01); C10M 111/04 (2006.01);
U.S. Cl.
CPC ...
F16L 15/08 (2013.01); C10M 111/04 (2013.01); C10M 169/04 (2013.01); F16L 15/004 (2013.01); F16L 15/04 (2013.01); F16L 15/06 (2013.01); F16L 58/182 (2013.01); C10M 2201/041 (2013.01); C10M 2201/0413 (2013.01); C10M 2201/062 (2013.01); C10M 2205/183 (2013.01); C10M 2207/026 (2013.01); C10M 2207/1203 (2013.01); C10M 2207/1265 (2013.01); C10M 2209/084 (2013.01); C10M 2209/0845 (2013.01); C10M 2215/064 (2013.01); C10N 2210/02 (2013.01); C10N 2210/04 (2013.01); C10N 2230/12 (2013.01); C10N 2230/64 (2013.01); C10N 2250/08 (2013.01); C10N 2250/10 (2013.01); C10N 2250/14 (2013.01); C10N 2280/00 (2013.01);
Abstract

A tubular threaded joint is constituted by a pin and a box each having a contact surface comprising an unthreaded metal contact portion including a seal portion and a shoulder portion and a threaded portion. Of the contact surface of at least one of the pin and the box, the surfaces of the seal portion and the shoulder portion has a first lubricating coating in the form of a solid lubricating coating, and the surface of the threaded portion or the entire surface of the contact surface has a second lubricating coating selected from a viscous liquid lubricating coating and a solid lubricating coating. The first lubricating coating has a coefficient of friction which is higher than that of the second lubricating coating, and the second lubricating coating is positioned on top in a portion where both the first lubricating coating and the second lubricating coating are present.

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