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. 19, 2021
Filed:
Dec. 27, 2017
Nippon Steel Corporation, Tokyo, JP;
Vallourec Oil and Gas France, Aulnoye-Aymeries, FR;
Masaaki Sugino, Tokyo, JP;
Shin Ugai, Tokyo, JP;
Nippon Steel Corporation, Tokyo, JP;
Vallourec Oil and Gas France, Aulnoye-Aymeries, FR;
Abstract
A threaded connection for steel pipe is provided that prevents galling on the sealing surfaces during make-up while providing high sealing performance after completion of make-up. The pin () includes a nose () including a pin taper guide surface () and a pin sealing surface () including a taper surface (). The box () includes a nose-receiving portion () including a box taper guide surface (), a box sealing surface () including a taper surface (), and a buffer surface (). The taper angle of the taper surfaces () includes a second taper angle larger than the taper angle of the taper guide surfaces (). The threaded connection () is constructed so as to satisfy Dp2>Db2>Dp1 and Lb2>Lp2. The buffer surface (), located between the box taper guide surface () and taper surface (), has a length of 0.75 mm or larger, and is located outward of an imaginary plane (V) determined along radial directions.