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. 25, 2021
Filed:
Jan. 17, 2018
Nippon Steel Corporation, Tokyo, JP;
Vallourec Oil and Gas France, Aulnoye-Aymeries, FR;
Satoshi Maruta, Tokyo, JP;
Yousuke Oku, Tokyo, JP;
Nippon Steel Corporation, Tokyo, JP;
Vallourec Oil and Gas France, Aulnoye-Aymeries, FR;
Abstract
A threaded connection that provides high sealing performance is provided. A threaded connection () includes a pin () and a box (). An inner male thread () of the pin () includes a parallel portion (). The parallel portion () is located at an end portion of the inner male thread () adjacent to the pin inner sealing surface (), and has thread roots parallel to the pipe axis. An inner female thread () of the box () includes a tapered portion (). The thread height in the tapered portion () is larger than that in the parallel portion (). Da<Db is satisfied, where Da is the difference in diameter between adjacent thread crests () in the tapered portion () in a longitudinal cross section of the pin () and box () as found when the connection is not made up, and Db is the difference between the diameter of the thread root () in the parallel portion () and the maximum diameter of the pin inner sealing surface ().