Patents by Inventor Yoichi Mukai
Yoichi Mukai 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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Publication number: 20220339449Abstract: An electrical stimulation therapeutic device includes a pair of application electrodes which are disposed at the back of a sacral bone of a person to be treated and supplies an electrical stimulation signal from the back of the sacral bone, a detection electrode which is disposed on a surface of a toe of the person to be treated and detects a myoelectric signal of the toe, a display portion which determines whether the myoelectric signal of the toe is generated in response to the stimulation signal, and a myoelectric signal processing portion which processes the myoelectric signal detected by the detection electrode to display it visually on the display portion, in which the myoelectric signal processing portion does not detect the myoelectric signal of the toe during a predetermined detection stop period of time from output of the stimulation signal, and the detection stop period of time is set on the basis of a quotient (x/v) obtained when a distance (x) from a sacral bone of a human body to a surface of aType: ApplicationFiled: December 26, 2019Publication date: October 27, 2022Applicants: OTSUKA TECHNO CORPORATION, ITO CO., LTD.Inventors: Takashi HISAMOTO, Yoichi MUKAI, Tetsuya MASUDA, Hiroki KAKUYAMA, Koji MAEDA, Shuhei UEDA
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Publication number: 20220298316Abstract: An electroconductive rubber sheet includes a sheet-shaped rubber base material having electrical conductivity and an electroconductive sheet embedded in the rubber base material. This electroconductive rubber sheet can be obtained according to a method for producing an electroconductive rubber sheet that includes, for example, a step of placing an electroconductive sheet and a sheet-shaped rubber material, which has electrical conductivity and an opening in a central portion of the sheet-shaped rubber material, on a mold and a step of pressing the electroconductive sheet and the rubber material at a temperature at which the rubber material is softened.Type: ApplicationFiled: August 28, 2020Publication date: September 22, 2022Applicants: ITO CO., LTD., OTSUKA TECHNO CORPORATIONInventors: Makoto SASAKI, Takashi HISAMOTO, Yoichi MUKAI, Tetsuya MASUDA, Hiroki KAKUYAMA
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Patent number: 9464337Abstract: Disclosed is a high strength steel sheet having excellent hydrogen embrittlement resistance. The steel sheet has a tensile strength of 1180 MPa or more, and satisfies the following conditions: with respect to an entire metallographic structure thereof, bainite, bainitic ferrite and tempered martensite account for 85 area % or more in total; retained austenite accounts for 1 area % or more; and fresh martensite accounts for 5 area % or less (including 0 area %).Type: GrantFiled: May 28, 2010Date of Patent: October 11, 2016Assignees: KABUSHIKI KAISHA KOBE SEIKO SHO, VOESTALPINE STAHL GMBHInventors: Yoichi Mukai, Kouji Kasuya, Michiharu Nakaya, Michitaka Tsunezawa, Fumio Yuse, Junichiro Kinugasa, Sandra Traint, Andreas Pichler
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Patent number: 9074272Abstract: A high-strength cold-rolled steel sheet excellent in uniform elongation, including in percent by mass: 0.10-0.28% of C; 1.0-2.0% of Si; and 1.0-3.0% of Mn, and the structures of the same having the space factors below to the entire structure: 30-65% of bainitic ferrite; 30-50% of polygonal ferrite; and 5-20% of residual austenite.Type: GrantFiled: March 28, 2006Date of Patent: July 7, 2015Assignee: Kobe Steel, Ltd.Inventors: Hiroshi Akamizu, Yoichi Mukai, Shushi Ikeda, Koichi Sugimoto
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Patent number: 8986468Abstract: A cold rolled steel sheet satisfying on the basis of percent by mass the chemical composition of 0.06-0.6% C, 0.1-2% Si, 0.01-3% Al, 1-4% Si+Al, 1-6% Mn, Si/Mn?0.40, in which there exists 10 or more pieces/100 ?m2 of Mn—Si composite oxide having Mn—Si atom ratio (Mn/Si) of 0.5 or over and major axis of from 0.01 ?m to 5 ?m and also having a covering ratio of 10% or below at which the surface of the steel sheet is covered with oxide containing Si as the main component.Type: GrantFiled: March 23, 2006Date of Patent: March 24, 2015Assignee: Kobe Steel, Ltd.Inventors: Masaaki Miura, Shinji Kozuma, Yoichi Mukai, Yoshinobu Omiya
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Patent number: 8795442Abstract: The invention provides a high strength cold rolled steel sheet having excellent chemical conversion treatment property stably even Mo is added aiming high strengthening. The surface property of the cold rolled steel sheet satisfies that the characteristic of 10 ?m or more of the maximum depth (Ry) of the unevenness and 30 ?m or less of the average spacing (Sm) of the unevenness, and that either one or more preferably both of, the characteristic of the load length ratio (tp40) of the unevenness of the surface is 20% or less, and the characteristic of the difference of the load length ratios (tp60) and (tp40) is 60% or more, is satisfied, and the crack of 3 ?m or less width and 5 ?m or more depth does not exist on the surface.Type: GrantFiled: March 29, 2007Date of Patent: August 5, 2014Assignee: Kobe Steel, Ltd.Inventors: Yoichi Mukai, Shinji Kozuma, Masahiro Nomura
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Patent number: 8673093Abstract: The present invention is the thin steel sheet containing C, Si, Mn, P, S, Al, Mo, Ti, B, and N wherein a value Z calculated by the equation described below is 2.0-6.0, an area ratio against all the structure is 1% or above for retained austenite and 80% or above for total of bainitic ferrite and martensite, a mean axis ratio of the retained austenite crystal grain is 5 or above, and tensile strength is 980 MPa or above where Value Z=9×[C]+[Mn]+3×[Mo]+490×[B]+7×[Mo]/{100×([B]+0.001),and the thin steel sheet has 980 MPa or above tensile strength and enhanced hydrogen embrittlement resistance properties.Type: GrantFiled: December 10, 2007Date of Patent: March 18, 2014Assignee: Kobe Steel, Ltd.Inventors: Muneaki Ikeda, Kouji Kasuya, Yoichi Mukai, Fumio Yuse, Junichiro Kinugasa
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Patent number: 8597439Abstract: A high-strength cold rolled steel sheet contains: 0.10 to 0.28% of C, 1.0 to 2.0% of Si, 1.0 to 3.0% of Mn, and 0.03 to 0.10% of Nb in terms of % by mass, Al is controlled to 0.5 or less, P is controlled to 0.15% or less, and S is controlled to 0.02% or less, and residual austenite accounts for 5 to 20%, bainitic ferrite accounts for 50% or more, and polygonal ferrite accounts for 30% or less (containing 0%), of the entire structure, and a mean number of residual austenite blocks is 20 or more as determined when the random area (15 ?m×15 ?m) is observed by EBSP (electron back scatter diffraction pattern).Type: GrantFiled: December 17, 2009Date of Patent: December 3, 2013Assignee: Kobe Steel, Ltd.Inventors: Shushi Ikeda, Yoichi Mukai, Hiroshi Akamizu, Koichi Makii, Koichi Sugimoto, Shunichi Hashimoto, Kenji Saito
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Patent number: 8197617Abstract: The present invention provides a high-strength steel sheet which has a 980 MPa class tensile strength as well as has excellent elongation, stretch flangeability and weldability, and also has excellent anti-delayed fraction property. The high-strength steel sheet comprises steel satisfying: C: 0.12 to 0.25%, Si: 1.0 to 3.0%, Mn: 1.5 to 3.0%, P: 0.15% or less, S: 0.02% or less, Al: 0.4% or less, and comprising the remnant made from iron and unavoidable impurities, wherein a ratio of the contents of Si and C (Si/C) is within the range from 7 to 14 in terms of a mass ratio, and a microstructure in a longitudinal section comprises, by an occupancy ratio based on the entire structure, 1) bainitic ferrite: 50% or more, 2) lath-type residual austenite: 3% or more, and 3) block-type residual austenite: 1% or more to ½×occupancy ratio of lath-type residual austenite, and 4) average size of block-type second phase is 10 ?m or less.Type: GrantFiled: June 4, 2007Date of Patent: June 12, 2012Assignee: Kobe Steel, Ltd.Inventors: Michiharu Nakaya, Yoichi Mukai, Koichi Sugimoto
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Publication number: 20120132327Abstract: Disclosed is a high strength steel sheet having excellent hydrogen embrittlement resistance. The steel sheet has a tensile strength of 1180 MPa or more, and satisfies the following conditions: with respect to an entire metallographic structure thereof, bainite, bainitic ferrite and tempered martensite account for 85 area % or more in total; retained austenite accounts for 1 area % or more; and fresh martensite accounts for 5 area % or less (including 0 area %).Type: ApplicationFiled: May 28, 2010Publication date: May 31, 2012Applicants: VOESTALPINE STAHL GMBH, Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)Inventors: Yoichi Mukai, Kouji Kasuya, Michiharu Nakaya, Michitaka Tsunezawa, Fumio Yuse, Junichiro Kinugasa, Sandra Traint, Andreas Pichler
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Patent number: 7887648Abstract: The invention relates to an ultrahigh-strength thin steel sheet excellent in the hydrogen embrittlement resistance, the steel sheet including, by weight %, 0.10 to 0.60% of C, 1.0 to 3.0% of Si, 1.0 to 3.5% of Mn, 0.15% or less of P, 0.02% or less of S, 1.5% or less of Al, 0.003 to 2.0% of Cr, and a balance including iron and inevitable impurities; in which grains of residual austenite have an average axis ratio (major axis/minor axis) of 5 or more, the grains of the residual austenite have an average minor axis length of 1 ?m or less, and the grains of the residual austenite have a nearest-neighbor distance between the grains of 1 ?m or less.Type: GrantFiled: December 28, 2006Date of Patent: February 15, 2011Assignee: Kobe Steel, Ltd.Inventors: Junichiro Kinugasa, Fumio Yuse, Yoichi Mukai, Shinji Kozuma, Hiroshi Akamizu, Kouji Kasuya, Muneaki Ikeda, Koichi Sugimoto
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Patent number: 7833363Abstract: A high-strength forged part is disclosed which comprises a base phase structure, comprising 30% or more of ferrite in terms of a space factor, and a second phase structure, comprising bainite and/or martensite, and retained austenite having an average gain diameter of 5 ?m or less and a content represented by 50X[C]<[V?R]<150x[C], wherein [V?R] represents a space factor of the retained austenite (?R) and [C] represents the mass % of C in the forged part. Furthermore, a high-strength forged part is disclosed which comprises a base phase structure, comprising 50% or more of tempered bainite or tempered martensite in terms of a space factor, and a second phase structure, comprising martensite and 3% to 30% retained austenite in terms of a space factor, wherein the portion of the retained austenite and martensite having an aspect ratio of 2 or less is 25% or less in terms of a space factor.Type: GrantFiled: October 18, 2007Date of Patent: November 16, 2010Assignee: Kobe Steel, Ltd.Inventors: Shushi Ikeda, Koichi Makii, Hiroshi Akamizu, Yoichi Mukai, Koh-ichi Sugimoto
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Publication number: 20100221138Abstract: The present invention provides a high-strength composite steel sheet which has a tensile strength of 980 MPa class as well as excellent and excellent anti-delayed fraction property, and also has excellent spot-weldability. The high-strength composite steel sheet comprises a steel satisfying: C: 0.10 to 0.25% (% by mass in case of a chemical component, the same shall apply hereinafter), Si: 1.0 to 3.0%, Mn: 1.5 to 3.0%, P: 0.15% or less, S: 0.02% or less, Al: 0.4% or less, and comprising the remnant made from iron and unavoidable impurities; the contents of Si, Al, Mn and Cr satisfy the relationship of “(Si+Al)/Mn or (Si+Al)/(Mn+Cr)=0.74 to 1.26”; and microstructure is specified.Type: ApplicationFiled: June 4, 2007Publication date: September 2, 2010Applicants: Kabushiki Kaisha Kobe Seiko Sho, Shinshu TLO Co., Ltd.Inventors: Michiharu Nakaya, Yoichi Mukai, Koichi Sugimoto
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Patent number: 7767036Abstract: A high-strength cold-rolled steel sheet exhibiting an excellent strength-workability balance, including in percent by mass: 0.10-0.25% of C; 1.0-2.0% of Si; 1.5-3.0% of Mn; 0.01% or less (not including 0%) of P; 0.005% or less (not including 0%) of S; 0.01-3.0% of Al; and remaining part consisting of iron and inevitable impurities, wherein the space factor of bainitic ferrite to the entire structure is 70% or more, the space factor of residual austenite to the entire structure is 5-20%, the hardness (HV) is 270 or greater, and the half-value width of an X-ray diffraction peak on a (200)-surface of ?-iron is 0.220 degrees or smaller.Type: GrantFiled: March 29, 2006Date of Patent: August 3, 2010Assignee: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)Inventors: Takahiro Kashima, Yoichi Mukai, Hiroshi Akamizu, Koichi Sugimoto
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Publication number: 20100172786Abstract: The present invention provides a high-strength steel sheet which has a 980 MPa class tensile strength as well as has excellent elongation, stretch flangeability and weldability, and also has excellent anti-delayed fraction property. The high-strength steel sheet comprises steel satisfying: C: 0.12 to 0.25%, Si: 1.0 to 3.0%, Mn: 1.5 to 3.0%, P: 0.15% or less, S: 0.02% or less, Al: 0.4% or less, and comprising the remnant made from iron and unavoidable impurities, wherein a ratio of the contents of Si and C (Si/C) is within the range from 7 to 14 in terms of a mass ratio, and a microstructure in a longitudinal section comprises, by an occupancy ratio based on the entire structure, 1) bainitic ferrite: 50% or more, 2) lath-type residual austenite: 3% or more, and 3) block-type residual austenite: 1% or more to ½×occupancy ratio of lath-type residual austenite, and 4) average size of block-type second phase is 10 ?m or less.Type: ApplicationFiled: June 4, 2007Publication date: July 8, 2010Applicants: KABUSHIKI KAISHA KOBE SEIKO SHO, SHINSHU TLO CO., LTD.Inventors: Michiharu Nakaya, Yoichi Mukai, Koichi Sugimoto
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Publication number: 20100092332Abstract: To provide a high-strength cold rolled steel sheet that has well-balanced tensile strength and elongation as well as well-balanced tensile strength and stretch-flangeability, and a plated steel sheet manufactured by plating the steel sheet. The high-strength cold rolled steel sheet contains: 0.10 to 0.28% of C, 1.0 to 2.0% of Si, 1.0 to 3.0% of Mn, and 0.03 to 0.10% of Nb in terms of % by mass, wherein the content of Al is controlled to 0.5 or less, the content of P is controlled to 0.15% or less, and the content of S is controlled to 0.02% or less, and wherein residual austenite accounts for 5 to 20%, bainitic ferrite accounts for 50% or more, and polygonal ferrite accounts for 30% or less (containing 0%), of the entire structure, and wherein a mean number of residual austenite blocks is 20 or more as determined when the random area (15 ?m×15 ?m) is observed by EBSP (electron back scatter diffraction pattern).Type: ApplicationFiled: December 17, 2009Publication date: April 15, 2010Applicant: Kabushiki Kaisha Kobe Seiko Sho(Kobe Steel, Ltd.)Inventors: Shushi IKEDA, Yoichi Mukai, Hiroshi Akamizu, Koichi Makii, Koichi Sugimoto, Shunichi Hashimoto, Kenji Saito
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Publication number: 20100080728Abstract: The present invention is the thin steel sheet containing C, Si, Mn, P, S, Al, Mo, Ti, B, and N wherein a value Z calculated by the equation described below is 2.0-6.0, an area ratio against all the structure is 1% or above for retained austenite and 80% or above for total of bainitic ferrite and martensite, a mean axis ratio of the retained austenite crystal grain is 5 or above, and tensile strength is 980 MPa or above. Value Z=9×[C]+[Mn]+3×[Mo]+490×[B]+7×[Mo]/{100×([B]+0.001)} Thus a high strength thin steel sheet with 980 MPa or above tensile strength and enhanced hydrogen embrittlement resistance properties can be provided. Also, in accordance with the present invention, the hot-rolled steel sheet for cold-rolling capable of manufacturing the high strength thin steel sheet with good productivity and having improved cold-rollability can be provided.Type: ApplicationFiled: December 10, 2007Publication date: April 1, 2010Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)Inventors: Muneaki Ikeda, Kouji Kasuya, Yoichi Mukai, Fumio Yuse, Junichiro Kinugasa
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Publication number: 20090277547Abstract: A high strength steel sheet with both excellent elongation and stretch-flanging performance is provided. The high strength steel sheet of the present invention comprises, in percent by mass, C: 0.05 to 0.3%, Si: 0.01 to 3.0%, Mn: 0.5 to 3.0%, Al: 0.01 to 0.1%, and Fe and inevitable impurities as the remainder, and has a structure mainly composed of tempered martensite and annealed bainite. The space factor of the tempered martensite is 50 to 95%, the space factor of the annealed bainite is 5 to 30%, and the mean grain size of the tempered martensite is 10 ?m or smaller in terms of the equivalent of a circle diameter. The steel sheet has a tensile strength of 590 MPa or higher.Type: ApplicationFiled: July 13, 2007Publication date: November 12, 2009Applicant: KABUSHIKI KAISHA KOBE SEIKO SHOInventors: Kenji Saito, Tomokazu Masuda, Masaaki Miura, Yoichi Mukai, Shushi Ikeda
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Publication number: 20090238713Abstract: The invention relates to an ultrahigh-strength thin steel sheet excellent in the hydrogen embrittlement resistance, the steel sheet including, by weight %, 0.10 to 0.60% of C, 1.0 to 3.0% of Si, 1.0 to 3.5% of Mn, 0.15% or less of P, 0.02% or less of S, 1.5% or less of Al, 0.003 to 2.0% of Cr, and a balance including iron and inevitable impurities; in which grains of residual austenite have an average axis ratio (major axis/minor axis) of 5 or more, the grains of the residual austenite have an average minor axis length of 1 ?m or less, and the grains of the residual austenite have a nearest-neighbor distance between the grains of 1 ?m or less.Type: ApplicationFiled: December 28, 2006Publication date: September 24, 2009Applicants: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.), Shinshu TLO Co., Ltd.Inventors: Junichiro Kinugasa, Fumio Yuse, Yoichi Mukai, Shinji Kozuma, Hiroshi Akamizu, Kouji Kasuya, Muneaki Ikeda, Koichi Sugimoto
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Patent number: D948553Type: GrantFiled: March 6, 2020Date of Patent: April 12, 2022Assignees: OTSUKA TECHNO CORPORATION, ITO CO., LTD.Inventors: Takashi Hisamoto, Yoichi Mukai, Tetsuya Masuda, Hiroki Kakuyama, Shuhei Ueda, Shinji Matsumoto, Koji Tsuji