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, 2011
Filed:
Mar. 29, 2010
Takahiro Takano, Wakayama, JP;
Shigeo Nagasaku, Nishinomiya, JP;
Masaaki Sugino, Nishinomiya, JP;
Takahiro Hamamoto, Wakayama, JP;
Suguru Yamaguchi, Amagasaki, JP;
Takahiro Takano, Wakayama, JP;
Shigeo Nagasaku, Nishinomiya, JP;
Masaaki Sugino, Nishinomiya, JP;
Takahiro Hamamoto, Wakayama, JP;
Suguru Yamaguchi, Amagasaki, JP;
Sumitomo Metal Industries, Ltd., Osaka, JP;
Vallourec Mannesmann Oil & Gas France, Aulnoye-Aymeries, FR;
Abstract
A threaded joint for steel pipes comprising a pinhaving a tapered male thread, a tapered sealing surface, and an end shoulder surfaceand a boxhaving correspondingly a tapered female thread, a tapered sealing surface, and a shoulder surfacewhich is capable of easy tightening and has improved air tightness by the sealing surfaces is arranged such that the pin and the box each have a noncontacting region B where the peripheral surfaces of the pin and the box do not contact each other between the sealing surfacesand the shoulder surfacesand. At least a portion of the noncontacting region of the pin adjoining the to end of the pin is a tapered surface portionhaving substantially the same angle of slope as the tapered sealing surface, and the noncontacting region of the box is a substantially cylindrical surface.