Patents by Inventor Hiroshi Chikatsune
Hiroshi Chikatsune 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).
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Patent number: 10443765Abstract: A threaded joint for pipes including a pin and a box, characterized in that the relationship 0.05 degrees??sb??sp?2.0 degrees is satisfied, where ?sb is an angle of an insertion surface of the female thread on the box side relative to a plane perpendicular to an axis of pipe, and ?sp is an angle of an insertion surface of the male thread, which faces the insertion surface of the female thread, on the pin side relative to the plane perpendicular to the axis of pipe.Type: GrantFiled: December 18, 2013Date of Patent: October 15, 2019Assignee: JFE STEEL CORPORATIONInventors: Takuya Nagahama, Hiroshi Chikatsune, Kazunari Takahashi, Masaki Yoshikawa, Jun Takano, Masateru Ueta, Takamasa Kawai
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Patent number: 10295091Abstract: A threaded joint is adapted for tubes where the stress or the strain concentration hardly occur at a threaded corner portion of box side even when the threaded joint receives repeated tensile-compressive forces or repeated bending forces. In a radial seal type threaded joint, tensile efficiency TE (%) defined by a ratio Sc/Sp between a cross-sectional area Sc, an area of Critical Cross Section (CCS) including a portion where a tensile stress and a strain become the highest in a tube circumferential cross section of a box and a cross-sectional area Sp of a tube body satisfies formula TE (%)?2.25×t/?+99.9 having a ratio t/? between an internal thread height t of the box and a radius of curvature ? of a corner portion of internally-threaded bottom load surface side.Type: GrantFiled: December 18, 2014Date of Patent: May 21, 2019Assignee: JFE Steel CorporationInventors: Masaki Yoshikawa, Hiroshi Chikatsune, Kazunari Takahashi, Takuya Nagahama, Jun Takano, Masateru Ueta, Takamasa Kawai
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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
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Publication number: 20180258709Abstract: A screw joint for a pipe comprising (1) a pin member, the raw pipe portion of which has an outer diameter set to 168.Type: ApplicationFiled: November 24, 2015Publication date: September 13, 2018Applicant: JFE STEEL CORPORATIONInventors: TSUYOSHI YONEYAMA, Hiroshi Chikatsune, Masaki Yoshikawa, Harunhiko SEKI, Jun TAKANO, Takuya Naghama, Masateru Ueta, Takamasa KAWAI
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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
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Patent number: 9982491Abstract: A threaded joint for an oil country tubular goods includes pins each of which occupies a pipe end portion of a steel pipe for an oil country tubular goods, and includes an externally-threaded portion, a nose extending toward a pipe end side from the externally-threaded portion, and a shoulder forming a distal end of the nose; and a box including internally-threaded portions each forming a threaded portion by being threadedly joined with the externally-threaded portion, and shoulders brought into contact with the shoulders of the pins, wherein the pins and the box being joined to each other by the threaded joining so that portions between the threaded portions and the shoulders are brought into metal-to-metal contact with each other to thereby form seal portions at the contact portions, and the shoulders of the pins and the shoulders of the box forming shoulder faces are brought into contact with each other at the time of make-up of the threaded joint, and a ratio of a chamfer length of pin thread to a threadType: GrantFiled: June 9, 2014Date of Patent: May 29, 2018Assignee: JFE Steel CorporationInventors: Takamasa Kawai, Kazunari Takahashi, Hiroshi Chikatsune, Masaki Yoshikawa, Jun Takano, Takuya Nagahama, Masateru Ueta
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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
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Patent number: 9657873Abstract: A threaded joint for steel pipes that includes a pin and a box. The pin has an externally threaded portion, a nose, and a shoulder portion. The box has an internally threaded portion, a sealing surface, and a shoulder portion. The outer circumferential surface of the nose of the pin has an outward convex curved shape, and the sealing surface of the box has a tapered shape. Additionally, the cross-sectional area of the pin at a seal point is 35% or more of the cross-sectional area of an original pipe portion corresponding to an unprocessed portion of the pin, the seal point being a portion on the pin that first comes into contact with the sealing surface of the box when the pin and the box are joined.Type: GrantFiled: February 24, 2012Date of Patent: May 23, 2017Assignee: JFE STEEL CORPORATIONInventors: Takamasa Kawai, Kazunari Takahashi, Hiroshi Chikatsune, Masaki Yoshikawa, Jun Takano, Takuya Nagahama, Masateru Ueta, Osamu Sonobe
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Publication number: 20160334033Abstract: A threaded joint is adapted for tubes where the stress or the strain concentration hardly occur at a threaded corner portion of box side even when the threaded joint receives repeated tensile-compressive forces or repeated bending forces. In a radial seal type threaded joint, tensile efficiency TE (%) defined by a ratio Sc/Sp between a cross-sectional area Sc, an area of Critical Cross Section (CCS) including a portion where a tensile stress and a strain become the highest in a tube circumferential cross section of a box and a cross-sectional area Sp of a tube body satisfies formula TE (%)?2.25×t/?+99.9 having a ratio t/? between an internal thread height t of the box and a radius of curvature ? of a corner portion of internally-threaded bottom load surface side.Type: ApplicationFiled: December 18, 2014Publication date: November 17, 2016Inventors: Masaki Yoshikawa, Hiroshi Chikatsune, Kazunari Takahashi, Takuya Nagahama, Jun Takano, Masateru Ueta, Takamasa Kawai
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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
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Patent number: 9470345Abstract: In the threaded joint for pipes, a coating having a Vickers hardness greater than or equal to 310 is formed on a threaded portion of the box and an inner face of the box corresponding to a seal portion. The seal interference amount ratio ?/D of the seal portion in a pipe circumferential direction is greater than or equal to 0.002, where D is a seal diameter defined as an outside diameter of the pin at a seal point that is a point on the outer peripheral face of the nose of the pin at which the outer peripheral face first comes into contact with the inner peripheral face of the nose of the box and ? is an interference amount defined as an amount by which the outside diameter at the seal point is reduced by the box when the pin and the box are threadedly connected with each other.Type: GrantFiled: October 16, 2012Date of Patent: October 18, 2016Assignee: JFE Steel CorporationInventors: Masaki Yoshikawa, Takuya Nagahama, Hiroshi Chikatsune, Jun Takano, Takamasa Kawai, Masateru Ueta, Kazunari Takahashi, Nobuhiko Morioka
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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
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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
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Publication number: 20160123091Abstract: A threaded joint for an oil country tubular goods includes pins each of which occupies a pipe end portion of a steel pipe for an oil country tubular goods, and includes an externally-threaded portion, a nose extending toward a pipe end side from the externally-threaded portion, and a shoulder forming a distal end of the nose; and a box including internally-threaded portions each forming a threaded portion by being threadedly joined with the externally-threaded portion, and shoulders brought into contact with the shoulders of the pins, wherein the pins and the box being joined to each other by the threaded joining so that portions between the threaded portions and the shoulders are brought into metal-to-metal contact with each other to thereby form seal portions at the contact portions, and the shoulders of the pins and the shoulders of the box forming shoulder faces are brought into contact with each other at the time of make-up of the threaded joint, and a ratio of a chamfer length of pin thread to a threadType: ApplicationFiled: June 9, 2014Publication date: May 5, 2016Inventors: Takamasa Kawai, Kazunari Takahashi, Hiroshi Chikatsune, Masaki Yoshikawa, Jun Takano, Takuya Nagahama, Masateru Ueta
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Publication number: 20150377391Abstract: A threaded joint for pipes including a pin and a box, characterized in that the relationship 0.05 degrees??sb??sp?2.0 degrees is satisfied, where ?sb is an angle of an insertion surface of the female thread on the box side relative to a plane perpendicular to an axis of pipe, and ?sp is an angle of an insertion surface of the male thread, which faces the insertion surface of the female thread, on the pin side relative to the plane perpendicular to the axis of pipe.Type: ApplicationFiled: December 18, 2013Publication date: December 31, 2015Inventors: Takuya NAGAHAMA, Hiroshi CHIKATSUNE, Kazunari TAKAHASHI, Masaki YOSHIKAWA, Jun TAKANO, Masateru UETA, Takamasa KAWAI
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Publication number: 20150198270Abstract: A threaded joint for pipes is provided in which a box-side lip length L, which is the axial distance between a pin-nose-end corresponding point P of the box component 1 and a load surface 18b of a lip-side internal thread ridge 50 closest to the pin-nose-end corresponding point P, is 300 or more times as long as an insertion surface interval ?, which is the axial interval between an insertion surface 19b of an internal thread ridge at a position two or more ridges backwards from the lip-side internal thread ridge 50 and an insertion surface 19a of an external thread ridge facing the insertion surface 19b when tightened, that is, L?300×?.Type: ApplicationFiled: July 1, 2013Publication date: July 16, 2015Applicant: JFE STEEL CORPORATIONInventors: Takuya Nagahama, Kazunari Takahashi, Hiroshi Chikatsune, Masaki Yoshikawa, Jun Takano, Takamasa Kawai, Masateru Ueta
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Patent number: 8991875Abstract: Provided is a threaded joint for steel pipes having high sealability even under a bending load. In the threaded joint, when a pin 3 and a box 1 are threadedly connected with each other, the outer peripheral face of a nose 8 of the pin and the inner peripheral face of a nose of the box are in metal-to-metal contact with each other at a contact portion and the contact portion serves as a seal portion 20. A threaded portion, at which the externally threaded portion 7 and the internally threaded portion 5 are threadedly connected with each other, has a negative load flank angle ?, shoulder portions 12 and 14 have a negative torque shoulder angle ?, and the ratio L/d0 of a length L of the nose and a pipe outside diameter d0 is equal to or higher than 0.08.Type: GrantFiled: February 24, 2012Date of Patent: March 31, 2015Assignee: JFE Steel CorporationInventors: Masaki Yoshikawa, Takuya Nagahama, Hiroshi Chikatsune, Jun Takano, Takamasa Kawai, Kazunari Takahashi, Masateru Ueta, Osamu Sonobe
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Publication number: 20150061287Abstract: In the threaded joint for pipes, a coating having a Vickers hardness greater than or equal to 310 is formed on a threaded portion of the box and an inner face of the box corresponding to a seal portion. The seal interference amount ratio ?/D of the seal portion in a pipe circumferential direction is greater than or equal to 0.002, where D is a seal diameter defined as an outside diameter of the pin at a seal point that is a point on the outer peripheral face of the nose of the pin at which the outer peripheral face first comes into contact with the inner peripheral face of the nose of the box and ? is an interference amount defined as an amount by which the outside diameter at the seal point is reduced by the box when the pin and the box are threadedly connected with each other.Type: ApplicationFiled: October 16, 2012Publication date: March 5, 2015Applicant: JFE Steel CorporationInventors: Masaki Yoshikawa, Takuya Nagahama, Hiroshi Chikatsune, Jun Takano, Takamasa Kawai, Masateru Ueta, Kazunari Takahashi, Nobuhiko Morioka
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Publication number: 20140116560Abstract: Radial seal type threaded joints for steel pipes have still room for improvement in ensuring sealability in terms of the rigidity of the pin nose. Specifically, the outer circumferential surface of the nose of the pin has an outward convex curved shape, and the sealing surface of the box has a tapered shape; and the cross-sectional area of the pin at a seal point that is a portion on the outer circumferential surface of the nose of the pin, the portion first coming into contact with the sealing surface of the box when threaded-joined, is 35% or more of the cross-sectional area of an original pipe portion corresponding to an unprocessed portion.Type: ApplicationFiled: February 24, 2012Publication date: May 1, 2014Applicant: JFE STEEL CORPORATIONInventors: Takamasa Kawai, Kazunari Takahashi, Hiroshi Chikatsune, Masaki Yoshikawa, Jun Takano, Takuya Nagahama, Masateru Ueta, Osamu Sonobe
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Publication number: 20140049045Abstract: Provided is a threaded joint for steel pipes having high sealability even under a bending load. In the threaded joint, when a pin 3 and a box 1 are threadedly connected with each other, the outer peripheral face of a nose 8 of the pin and the inner peripheral face of a nose of the box are in metal-to-metal contact with each other at a contact portion and the contact portion serves as a seal portion 20. A threaded portion, at which the externally threaded portion 7 and the internally threaded portion 5 are threadedly connected with each other, has a negative load flank angle ?, shoulder portions 12 and 14 have a negative torque shoulder angle ?, and the ratio L/d0 of a length L of the nose and a pipe outside diameter d0 is equal to or higher than 0.08.Type: ApplicationFiled: February 24, 2012Publication date: February 20, 2014Applicant: JFE Steel CorporationInventors: Masaki Yoshikawa, Takuya Nagahama, Hiroshi Chikatsune, Jun Takano, Takamasa Kawai, Kazunari Takahashi, Masateru Ueta, Osamu Sonobe