Patents by Inventor Hidekazu Minami

Hidekazu Minami 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: 10934600
    Abstract: A steel sheet has a microstructure that contains ferrite in an area ratio of 20% or more, martensite in an area ratio of 5% or more, and tempered martensite in an area ratio of 5% or more. The ferrite has a mean grain size of 20.0 ?m or less. An inverse intensity ratio of ?-fiber to ?-fiber in the ferrite is 1.00 or more and an inverse intensity ratio of ?-fiber to ?-fiber in the martensite and the tempered martensite is 1.00 or more.
    Type: Grant
    Filed: January 27, 2016
    Date of Patent: March 2, 2021
    Assignee: JFE STEEL CORPORATION
    Inventors: Hidekazu Minami, Shinjiro Kaneko, Takeshi Yokota, Kazuhiro Seto
  • Publication number: 20210040577
    Abstract: A high-strength cold-rolled steel sheet or high-strength coated steel sheet that has a tensile strength (TS) of 780 MPa or more and has high ductility, stretch-flangeability, and in-plane stability of stretch-flangeability and methods for producing the same. The high-strength cold-rolled steel sheet has a specified chemical composition and a microstructure comprising, by area fraction, in a range of 50% to 80% of ferrite, 8% or less of martensite with an average grain size of 2.5 ?m or less, in a range of 6% to 15% of retained austenite, and in a range of 3% to 40% of tempered martensite. A ratio fM/fM+TM being 50% or less, where fM denotes the area fraction of martensite and fM+TM denotes the total area fraction of martensite and tempered martensite, and a standard deviation of the grain size of martensite at certain portions being 0.7 ?m or less.
    Type: Application
    Filed: January 21, 2019
    Publication date: February 11, 2021
    Applicant: JFE STEEL CORPORATION
    Inventors: Seigo TSUCHIHASHI, Shinsuke KOMINE, Tatsuya NAKAGAITO, Hidekazu MINAMI
  • Publication number: 20200283862
    Abstract: Provided is a high-strength steel sheet having a tensile strength (TS) of 750 MPa or more and excellent in ductility and stretch flangeability, in which the steel sheet has a predetermined chemical composition and a microstructure containing, in area ratio, ferrite: 50% to 90%, quenched martensite: 1% to 8%, tempered martensite: 3% to 40%, and retained austenite: 6% to 15%, the quenched martensite has an average grain size of 2.5 ?m or less, the quenched martensite has an average circularity index of 0.50 or more, the circularity index being defined as 4 ?M/D2, where D is a perimeter of the quenched martensite and M is an area of the quenched martensite, and the steel sheet has a ratio of an area ratio of the quenched martensite fM to a total area ratio of the quenched martensite and the tempered martensite fM+TM, fM/fM+TM, of 50% or less.
    Type: Application
    Filed: October 29, 2018
    Publication date: September 10, 2020
    Applicant: JFE STEEL CORPORATION
    Inventors: Seigo TSUCHIHASHI, Hidekazu MINAMI, Takashi KOBAYASHI
  • Publication number: 20200248280
    Abstract: A steel sheet is provided, having a tensile strength of 590 MPa or more, a particular composition and a steel structure that contains, in terms of area fraction, particular amounts of ferrite and martensite, in which the ferrite average crystal grain size is 20 ?m or less, the martensite average size is 15 ?m or less, the ratio of the average crystal grain size of the ferrite to the average size of the martensite (ferrite average crystal grain size/martensite average size) is 0.5 to 10.0, the ratio of the hardness of the martensite to the hardness of the ferrite (martensite hardness/ferrite hardness) is 1.0 or more and 5.0 or less, and, in the texture of the ferrite, the inverse intensity ratio of ?-fiber to the ?-fiber is 0.8 or more and 7.0 or less.
    Type: Application
    Filed: March 7, 2017
    Publication date: August 6, 2020
    Applicant: JFE Steel Corporation
    Inventors: Hidekazu Minami, Yoshimasa Funakawa, Shinjiro Kaneko
  • Patent number: 10563279
    Abstract: A high strength steel sheet having a high Young's modulus, the steel sheet having a chemical composition including, by mass %, C: 0.060% or more and 0.150% or less, Si: 0.50% or more and 2.20% or less, Mn: 1.00% or more and 3.00% or less, and one or both of Ti: 0.001% or more and 0.200% or less and Nb: 0.001% or more and 0.200% or less, in which the contents of C, N, S, Ti, and Nb satisfy the equation 500?C*?1300. The steel sheet has a microstructure including ferrite in an amount of 20% or more and martensite in an amount of 5% or more, in terms of area ratio, such that the average grain size of the ferrite is 20.0 ?m or less and the inverse intensity ratio of ?-fiber for ?-fiber is 1.00 or more in the ferrite and the martensite.
    Type: Grant
    Filed: July 16, 2014
    Date of Patent: February 18, 2020
    Assignee: JFE STEEL CORPORATION
    Inventors: Hidekazu Minami, Takeshi Yokota, Kazuhiro Seto
  • Publication number: 20200040420
    Abstract: There is provided a high-strength steel sheet and a method for producing the same. The high-strength steel sheet has a specified chemical composition and a steel microstructure including, by area fraction, 75.0% or more tempered martensite, 1.0% or more and 20.0% or less fresh martensite, and 5.0% or more and 20.0% or less retained austenite. A hardness ratio of the fresh martensite to the tempered martensite is 1.5 or more and 3.0 or less, the ratio of the maximum KAM value in the tempered martensite in the vicinity of the heterophase interface between the tempered martensite and the fresh martensite to the average KAM value in the tempered martensite is 1.5 or more and 30.0 or less, and the average of ratios of grain sizes of prior austenite grains in the rolling direction to those in the thickness direction is 2.0 or less.
    Type: Application
    Filed: February 9, 2018
    Publication date: February 6, 2020
    Applicant: JFE STEEL CORPORATION
    Inventors: Hidekazu MINAMI, Fusae SHIIMORI, Shinjiro KANEKO, Takashi KOBAYASHI, Yuji TANAKA
  • Publication number: 20200014941
    Abstract: It is configured to include a video signal compression unit that compresses a video signal for displaying, on an image inspection monitor, an image inspection screen including a first area for displaying a medical image and a second area for displaying information other than the medical image, and a transmitting unit that transmits, via a communication network, the video signal having been compressed, and the video signal compression unit compresses, in each frame of the video signal, the second area of the image inspection screen at a compression rate higher than a compression rate of the first area.
    Type: Application
    Filed: July 1, 2019
    Publication date: January 9, 2020
    Inventor: Hidekazu MINAMI
  • Publication number: 20190372247
    Abstract: A circuit connection device having one or a plurality of terminals, circuit board, tubular case body, terminal inserting portion and insulating first and second retainers. The terminal(s) are electrically connected to the circuit board. The case body accommodates the circuit board and has an opening at its one end. The terminal inserting portion has one or a plurality of penetration holes and closes the opening of the case body. The first and second retainers are accommodated in the case body. The terminal(s) are inserted into the penetration hole(s). The first retainer has terminal retaining portion retaining terminal(s). The second retainer has a positioning portion maintaining a position relationship with the circuit board, and is engaged with the first retainer. The first and second retainers are configured so that movement of the terminal(s) is restrained and the terminal(s) are connected to the circuit board.
    Type: Application
    Filed: January 19, 2018
    Publication date: December 5, 2019
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventors: Hidekazu MINAMI, Takashi KODA, Shingo YOSHIDA
  • Publication number: 20190363466
    Abstract: A circuit connection device for connecting circuit to an electronic device having one or a plurality of first terminals, circuit board, tubular case body, terminal inserting portion, terminal core and guide. The first terminal is electrically connected to circuit board. The case body accommodates circuit board and has an opening at its one end. The terminal inserting portion has a penetration hole and closes an opening of the case body. The terminal core is placed in case body. The guide is configured to guide the terminal core in an axis direction of the case body. The first terminal is inserted into the penetration hole of the terminal inserting portion. The terminal core has one or a plurality of second terminals electrically connected to the circuit board and insulating retainer retaining the second terminal. The retainer has a positioning portion that maintains a position relationship with circuit board.
    Type: Application
    Filed: January 19, 2018
    Publication date: November 28, 2019
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventors: Hidekazu MINAMI, Takashi KODA, Shingo YOSHIDA
  • Publication number: 20190360081
    Abstract: There is provided a high-strength steel sheet and a method for producing the same. The steel sheet has a specified chemical composition and a microstructure including, in terms of area percentage, 20.0% or more and 60.0% or less ferrite, 40.0% or more and 80.0% or less of a hard phase composed of bainitic ferrite, tempered martensite, fresh martensite, and retained austenite, 35.0% or more and 55.0% or less bainitic ferrite with respect to the entire hard phase, 20.0% or more and 40.0% or less tempered martensite with respect to the entire hard phase, 3.0% or more and 15.0% or less fresh martensite with respect to the entire hard phase, and 5.0% or more and 20.0% or less retained austenite with respect to the entire hard phase.
    Type: Application
    Filed: February 9, 2018
    Publication date: November 28, 2019
    Applicant: JFE STEEL CORPORATION
    Inventors: Hidekazu MINAMI, Takashi KOBAYASHI, Shinjiro KANEKO, Yuji TANAKA
  • Patent number: 10472697
    Abstract: A steel sheet has a microstructure that contains ferrite in an area ratio of 20% or more, martensite in an area ratio of 5% or more, and tempered martensite in an area ratio of 5% or more. The ferrite has a mean grain size of 20.0 ?m or less. An inverse intensity ratio of ?-fiber to ?-fiber in the ferrite is 1.00 or more and an inverse intensity ratio of ?-fiber to ?-fiber in the martensite and the tempered martensite is 1.00 or more.
    Type: Grant
    Filed: January 27, 2016
    Date of Patent: November 12, 2019
    Assignee: JFE STEEL CORPORATION
    Inventors: Hidekazu Minami, Shinjiro Kaneko, Takeshi Yokota, Kazuhiro Seto
  • Publication number: 20190323101
    Abstract: A high strength steel sheet having a high Young's modulus, the steel sheet having a chemical composition including, by mass %, C: 0.060% or more and 0.150% or less, Si: 0.50% or more and 2.20% or less, Mn: 1.00% or more and 3.00% or less, and one or both of Ti: 0.001% or more and 0.200% or less and Nb: 0.001% or more and 0.200% or less, in which the contents of C, N, S, Ti, and Nb satisfy the equation 500?C*?1300. The steel sheet has a microstructure including ferrite in an amount of 20% or more and martensite in an amount of 5% or more, in terms of area ratio, such that the average grain size of the ferrite is 20.0 ?m or less and the inverse intensity ratio of ?-fiber for ?-fiber is 1.00 or more in the ferrite and the martensite.
    Type: Application
    Filed: June 26, 2019
    Publication date: October 24, 2019
    Applicant: JFE STEEL CORPORATION
    Inventors: Hidekazu MINAMI, Takeshi YOKOTA, Kazuhiro SETO
  • Patent number: 10385431
    Abstract: A high strength steel sheet having a high Young's modulus, the steel sheet having a chemical composition including, by mass %, C: 0.060% or more and 0.150% or less, Si: 0.50% or more and 2.20% or less, Mn: 1.00% or more and 3.00% or less, Nb: 0.001% or more and 0.200% or less, and V: 0.001% or more and 0.200% or less, in which the contents of C, Nb, and V satisfy the equation 500?C*?1300. The steel sheet has a microstructure including ferrite in an amount of 20% or more and martensite in an amount of 5% or more, in terms of area ratio, such that the average grain size of the ferrite is 20.0 ?m or less and the inverse intensity ratio of ?-fiber for ?-fiber is 1.00 or more in each of the ferrite and the martensite.
    Type: Grant
    Filed: July 16, 2014
    Date of Patent: August 20, 2019
    Assignee: JFE STEEL CORPORATION
    Inventors: Hidekazu Minami, Takeshi Yokota, Kazuhiro Seto
  • Publication number: 20190226067
    Abstract: A high-strength steel sheet having a TS of 780 MPa or more, excellent stretch flangeability, and excellent in-plane anisotropy of TS is provided. A high-strength steel sheet comprises: a predetermined chemical composition; a steel microstructure including, in area fraction, ferrite: 20% or more and 50% or less, lower bainite: 5% or more and 40% or less, martensite: 1% or more and 20% or less, and tempered martensite: 20% or less, and including, in volume fraction, retained austenite: 5% or more, the retained austenite having an average grain size of 2 ?m or less; and a texture having an inverse intensity ratio of ?-fiber to ?-fiber of 3.0 or less.
    Type: Application
    Filed: August 29, 2017
    Publication date: July 25, 2019
    Applicant: JFE STEEL CORPORATION
    Inventors: Hidekazu MINAMI, Shinjiro KANEKO, Reiko SUGIHARA, Kazunori TAHARA, Kazuma MORI
  • Publication number: 20190203316
    Abstract: A high-strength steel sheet having a TS of 780 MPa or more, not only excellent ductility but also excellent stretch flangeability, and excellent in-plane anisotropy of TS is provided. A high-strength steel sheet comprises: a predetermined chemical composition; a steel microstructure including, in area fraction, ferrite: 20% or more and 50% or less, upper bainite: 5% or more and 45% or less, and martensite: 1% or more and 20% or less, and including, in volume fraction, retained austenite: 5% or more, the retained austenite having an average grain size of 2 ?m or less; and a texture having an inverse intensity ratio of ?-fiber to ?-fiber of 3.0 or less.
    Type: Application
    Filed: August 29, 2017
    Publication date: July 4, 2019
    Applicant: JFE STEEL CORPORATION
    Inventors: Hidekazu MINAMI, Shinjiro KANEKO
  • Patent number: 10302542
    Abstract: In a particulate detection system (10), a control board (911), a high voltage generation board (913) and an isolation transformer (720) are respectively disposed in a first space (921d) and a second space (921e) separated from each other by an inner case (923). When electromagnetic noise is generated in the high voltage generation board (913) and the isolation transformer (720); specifically, at the primary winding of the isolation transformer 720, at the time of switching the primary current supply, the electromagnetic noise is blocked by the inner case (923). This configuration reduces the influence of electromagnetic noise generated in the primary winding on the control board (911).
    Type: Grant
    Filed: May 18, 2017
    Date of Patent: May 28, 2019
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Hidekazu Minami, Kaoru Hisada
  • Publication number: 20190127819
    Abstract: A steel sheet is provided, having a tensile strength of 340 MPa or more, a particular composition and a steel structure in which ferrite has an average crystal grain size of 5 m or more and 25 m or less, 40% or more of cementite in terms of area fraction precipitates in ferrite grain boundaries, and the ferrite has a texture in which an inverse intensity ratio of ?-fiber to ?-fiber is 0.8 or more and 7.0 or less.
    Type: Application
    Filed: March 7, 2017
    Publication date: May 2, 2019
    Applicant: JFE Steel Corporation
    Inventors: Hidekazu Minami, Yoshimasa Funakawa
  • Publication number: 20190100819
    Abstract: A steel sheet is provided that has a tensile strength of 540 MPa or more, includes a particular composition; and has a steel structure containing ferrite and a secondary phase, in which an area fraction of the ferrite is 50% or more, the secondary phase contains 1.0% or more and 25.0% or less of martensite in terms of area fraction with respect to the entirety, the ferrite has an average crystal grain size of 3 ?m or more, a difference in hardness between the ferrite and the martensite is 1.0 GPa or more and 8.0 GPa or less, and, in a texture of the ferrite, an inverse intensity ratio of ?-fiber to ?-fiber is 0.8 or more and 7.0 or less.
    Type: Application
    Filed: March 7, 2017
    Publication date: April 4, 2019
    Applicant: JFE Steel Corporation
    Inventors: Hidekazu Minami, Yoshimasa Funakawa, Shinjiro Kaneko
  • Publication number: 20180179610
    Abstract: A steel sheet has a microstructure that contains ferrite in an area ratio of 20% or more, martensite in an area ratio of 5% or more, and tempered martensite in an area ratio of 5% or more. The ferrite has a mean grain size of 20.0 ?m or less. An inverse intensity ratio of ?-fiber to ?-fiber in the ferrite is 1.00 or more and an inverse intensity ratio of ?-fiber to ?-fiber in the martensite and the tempered martensite is 1.00 or more.
    Type: Application
    Filed: January 27, 2016
    Publication date: June 28, 2018
    Applicant: JFE STEEL CORPORATION
    Inventors: Hidekazu MINAMI, Shinjiro KANEKO, Takeshi YOKOTA, Kazuhiro SETO
  • Publication number: 20180023160
    Abstract: A steel sheet has a microstructure that contains ferrite in an area ratio of 20% or more, martensite in an area ratio of 5% or more, and tempered martensite in an area ratio of 5% or more. The ferrite has a mean grain size of 20.0 ?m or less. An inverse intensity ratio of ?-fiber to ?-fiber in the ferrite is 1.00 or more and an inverse intensity ratio of ?-fiber to ?-fiber in the martensite and the tempered martensite is 1.00 or more.
    Type: Application
    Filed: January 27, 2016
    Publication date: January 25, 2018
    Applicant: JFE STEEL CORPORATION
    Inventors: Hidekazu MINAMI, Shinjiro KANEKO, Takeshi YOKOTA, Kazuhiro SETO