Patents by Inventor Haruhiko Seki
Haruhiko Seki has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
-
Patent number: 11549620Abstract: A screw joint in which an efficient screw length of a joint portion is achieved. This screw joint is for an oil well pipe of an integral type and includes: (i) a pin that is provided with a male screw portion which is a male taper screw, at one end of a steel pipe; and (ii) a box that is provided with a female screw portion which is a female taper screw fitted to the male screw portion, at one end of the steel pipe, in which a structure, in which the pin and the box are in metal contact with each other to seal a fluid, is provided at least at one place of a seal portion on an outer peripheral surface side of a pipe end side of the pin and a seal portion on an inner peripheral surface side of a pipe end side of the box.Type: GrantFiled: February 14, 2019Date of Patent: January 10, 2023Assignee: JFE STEEL CORPORATIONInventors: Takamasa Kawai, Masaki Yoshikawa, Jun Takano, Takuya Nagahama, Haruhiko Seki
-
Publication number: 20210025523Abstract: A screw joint in which an efficient screw length of a joint portion is achieved.Type: ApplicationFiled: February 14, 2019Publication date: January 28, 2021Applicant: JFE STEEL CORPORATIONInventors: Takamasa KAWAI, Masaki YOSHIKAWA, Jun TAKANO, Takuya NAGAHAMA, Haruhiko SEKI
-
Patent number: 10900595Abstract: Provided is a threaded joint for an oil well tubing which possesses sufficient sealability when the external pressure is applied to the threaded joint by suppressing the plastic deformation of a nose portion and sufficient galling resistance. The sufficient galling resistance is provided by preventing the occurrence of galling at the time of making up the threaded joint during verification test performed in accordance with ISO13679:2002 even when the threaded joint for an oil well tubing has a small thickness. Parameters including sizes of the threaded joint at positions of a seal point and shoulder portions satisfy formula 1 ((Ds12?Ds02)/(D12?D02)?0.30), formula 2 (tan ?>(?D+?)/{2(Lt?Ls)}), and Ls/Ln is set to 0.2 to 0.6.Type: GrantFiled: December 16, 2016Date of Patent: January 26, 2021Assignee: JFE Steel CorporationInventors: Takamasa Kawai, Taro Kanayama, Masaki Yoshikawa, Haruhiko Seki, Masateru Ueta, Jun Takano, Tsuyoshi Yoneyama
-
Publication number: 20190056049Abstract: Provided is a threaded joint for an oil well tubing which possesses sufficient sealability when the external pressure is applied to the threaded joint by suppressing the plastic deformation of a nose portion and sufficient galling resistance. The sufficient galling resistance is provided by preventing the occurrence of galling at the time of making up the threaded joint during verification test performed in accordance with ISO13679:2002 even when the threaded joint for an oil well tubing has a small thickness. Parameters including sizes of the threaded joint at positions of a seal point and shoulder portions satisfy formula 1 ((Ds12?Ds02)/(D12?D02)?0.30), formula 2 (tan ?>(?D+?)/{2(Lt?Ls)}), and Ls/Ln is set to 0.2 to 0.6.Type: ApplicationFiled: December 16, 2016Publication date: February 21, 2019Applicant: JFE Steel CorporationInventors: Takamasa Kawai, Taro Kanayama, Masaki Yoshikawa, Haruhiko Seki, Masateru Ueta, Jun Takano, Tsuyoshi Yoneyama
-
Patent number: 10125554Abstract: In a joint for oil country tubular goods, a pitch change is made such that an internally-thread pitch has the same value as an externally-thread pitch from a thread end portion on a box end side to a pitch change position taken on a box center side with respect to a position away from the thread end portion by ½ of an entire length of the threaded portion, and the internally-thread pitch is changed to a value less than the externally-thread pitch at the pitch change position so that a thread gap is gradually decreased from the pitch change position to a position of the thread end portion on the box center side, and the thread gap is eventually set to a value which is 0.2 to 0.8 times as large as the thread gap before the pitch change is made.Type: GrantFiled: June 9, 2014Date of Patent: November 13, 2018Assignee: JFE Steel CorporationInventors: Takamasa Kawai, Kazunari Takahashi, Hiroshi Chikatsune, Masaki Yoshikawa, Jun Takano, Takuya Nagahama, Masateru Ueta, Hideo Sato, Haruhiko Seki, Tsuyoshi Yoneyama
-
Patent number: 9982815Abstract: A premium threaded joint has a pin-side shoulder angle ?1, a box-side shoulder angle ?2, a seal interference quantity ? and a seal point distance xp satisfying ?2??1=?×?/xp, ?=7 to 14, and a pin distal end thickness tp1 defined by a difference Re?Ri between a radius Re of a pin most distal end portion and an inner radius Ri of a pin distal end portion is 0.25 times or more as large as a pin raw pipe thickness tp0.Type: GrantFiled: July 29, 2014Date of Patent: May 29, 2018Assignee: JFE Steel CorporationInventors: Takamasa Kawai, Kazunari Takahashi, Hiroshi Chikatsune, Masaki Yoshikawa, Jun Takano, Takuya Nagahama, Masateru Ueta, Hideo Sato, Haruhiko Seki, Tsuyoshi Yoneyama
-
Patent number: 9709196Abstract: A threaded joint for heavy-walled oil country tubular goods can both ensure sealability and prevent galling in a state where a high external pressure is also applied to the threaded joint in addition to a high compressive force. A surface of a pin side forming a seal portion and a surface of a box side forming a seal portion are formed into a convex curved surface and a tapered surface, respectively. A seal thickness ts of the pin is 15 mm or less, a shape parameter ts/D (D: outer diameter of a pin raw pipe portion) is 0.045 or more, and a complete thread length ratio L/t (L: complete thread length of the pin, t: wall thickness of the pin raw pipe portion) is 4.0 or less.Type: GrantFiled: October 30, 2014Date of Patent: July 18, 2017Assignee: JFE Steel CorporationInventors: Takamasa Kawai, Kazunari Takahashi, Hiroshi Chikatsune, Masaki Yoshikawa, Jun Takano, Takuya Nagahama, Masateru Ueta, Tsuyoshi Yoneyama, Hideo Sato, Haruhiko Seki
-
Publication number: 20160319966Abstract: A threaded joint for heavy-walled oil country tubular goods can both ensure sealability and prevent galling in a state where a high external pressure is also applied to the threaded joint in addition to a high compressive force. A surface of a pin side forming a seal portion and a surface of a box side forming a seal portion are formed into a convex curved surface and a tapered surface, respectively. A seal thickness ts of the pin is 15 mm or less, a shape parameter ts/D (D: outer diameter of a pin raw pipe portion) is 0.045 or more, and a complete thread length ratio L/t (L: complete thread length of the pin, t: wall thickness of the pin raw pipe portion) is 4.0 or less.Type: ApplicationFiled: October 30, 2014Publication date: November 3, 2016Inventors: Takamasa Kawai, Kazunari Takahashi, Hiroshi Chikatsune, Masaki Yoshikawa, Jun Takano, Takuya Nagahama, Masateru Ueta, Tsuyoshi Yoneyama, Hideo Sato, Haruhiko Seki
-
Publication number: 20160178095Abstract: A premium threaded joint has a pin-side shoulder angle ?1, a box-side shoulder angle ?2, a seal interference quantity ? and a seal point distance xp satisfying ?2??1=?×?/xp, ?=7 to 14, and a pin distal end thickness tp1 defined by a difference Re?Ri between a radius Re of a pin most distal end portion and an inner radius Ri of a pin distal end portion is 0.25 times or more as large as a pin raw pipe thickness tp0.Type: ApplicationFiled: July 29, 2014Publication date: June 23, 2016Inventors: Takamasa Kawai, Kazunari Takahashi, Hiroshi Chikatsune, Masaki Yoshikawa, Jun Takano, Takuya Nagahama, Masateru Ueta, Hideo Sato, Haruhiko Seki, Tsuyoshi Yoneyama
-
Publication number: 20160130884Abstract: In a joint for oil country tubular goods, a pitch change is made such that an internally-thread pitch has the same value as an externally-thread pitch from a thread end portion on a box end side to a pitch change position taken on a box center side with respect to a position away from the thread end portion by ½ of an entire length of the threaded portion, and the internally-thread pitch is changed to a value less than the externally-thread pitch at the pitch change position so that a thread gap is gradually decreased from the pitch change position to a position of the thread end portion on the box center side, and the thread gap is eventually set to a value which is 0.2 to 0.8 times as large as the thread gap before the pitch change is made.Type: ApplicationFiled: June 9, 2014Publication date: May 12, 2016Applicant: JFE STEEL CORPORATIONInventors: Takamasa Kawai, Kazunari Takahashi, Hiroshi Chikatsune, Masaki Yoshikawa, Jun Takano, Takuya Nagahama, Masateru Ueta, Hideo Sato, Haruhiko Seki, Tsuyoshi Yoneyama