Patents by Inventor Masaharu Oka

Masaharu Oka 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: 10815553
    Abstract: Provided is a galvannealed steel sheet having high strength and excellent deep drawability, and being further excellent in slab cracking resistance and secondary working embrittlement resistance. A base metal steel sheet of the galvannealed steel sheet has a chemical composition containing, in mass %: C: 0.0080% or less; Si: 0.7% or less; Mn: 1.0 to 2.5%; P: more than 0.030 to 0.048%; S: 0.025% or less; Al: 0.005 to 0.20%; N: 0.010% or less; Ti: 0.005 to 0.040%; Nb: 0.005 to 0.060%; and B: 0.0005 to 0.0030%, with the balance being Fe and impurities, satisfying Formula (1) to (4). A galvannealed layer contains 7 to 15 mass % of Fe. 25×P+4×Si?3.6??(1) B?X1?0.0005??(2) C?(12/93)×Nb?X2??0.
    Type: Grant
    Filed: August 22, 2016
    Date of Patent: October 27, 2020
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Masaharu Oka, Nobusato Kojima, Tetsuya Okada
  • Publication number: 20200048730
    Abstract: A steel sheet for a drawn can has a predetermined chemical composition and has a ferrite single-phase structure with a crystal grain size number of 11.0 or more, the sheet thickness is 0.15 to 0.50 mm, in an L direction of the steel sheet after an ageing treatment at 100° C. for one hour, an yield strength YP is 220 to 290 MPa, a tensile strength TS is 330 to 390 MPa, a total elongation EL is 32% or more, an yield point elongation YP-EL is 0%, an average plastic strain ratio rm is more than 1.35, and an in-plane anisotropy ?r is ?0.30 to +0.15.
    Type: Application
    Filed: April 19, 2018
    Publication date: February 13, 2020
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Masaharu OKA, Nobusato KOJIMA, Yuta DAIROKUNO, Michihiro NONO
  • Patent number: 10336037
    Abstract: A galvanized steel sheet according to the present invention includes a steel sheet and a galvanizing layer which is formed on a surface of the steel sheet. The steel sheet includes as a chemical component, by mass %, C: more than 0.100% to 0.500%, Si: 0.0001% to less than 0.20%, Mn: more than 0.20% to 3.00%, Al: 3.0% to 10.0%, N: 0.0030% to 0.0100%, Ti: more than 0.100% to 1.000%, P: 0.00001% to 0.0200%, S: 0.00001% to 0.0100% and a remainder including Fe and impurities. The galvanizing layer includes as a chemical composition, by mass %, Fe: 0.01% to 15% and a remainder including Zn and impurities. The galvanized steel sheet has a specific gravity of 5.5 to less than 7.5.
    Type: Grant
    Filed: April 28, 2014
    Date of Patent: July 2, 2019
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Masaharu Oka, Nobuhiro Fujita, Manabu Takahashi, Riki Okamoto, Kenichiroh Matsumura
  • Patent number: 10294551
    Abstract: A steel sheet including, by mass %, C: more than 0.100% and 0.500% or less, Si: 0.0001% or more and less than 0.20%, Mn: more than 0.20% and 0.50% or less, Al: 3.0% or more and 10.0% or less, N: 0.0030% or more and 0.0100% or less, Ti: more than 0.100% and 1.000% or less, P: 0.00001% or more and 0.0200% or less, S: 0.00001% or more and 0.0100% or less, and a remainder including Fe and impurities, in which a sum of a C content and a Ti content satisfies 0.200<C+Ti?1.500 by mass %, a product of an Al content and an Si content satisfies Al×Si?0.8 by mass %, and a specific gravity is 5.5 to less than 7.5.
    Type: Grant
    Filed: April 28, 2014
    Date of Patent: May 21, 2019
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Masaharu Oka, Nobuhiro Fujita, Manabu Takahashi, Riki Okamoto, Chisato Wakabayashi
  • Publication number: 20180258514
    Abstract: Provided is a galvannealed steel sheet having high strength and excellent deep drawability, and being further excellent in slab cracking resistance and secondary working embrittlement resistance. A base metal steel sheet of the galvannealed steel sheet has a chemical composition containing, in mass %: C: 0.0080% or less; Si: 0.7% or less; Mn: 1.0 to 2.5%; P: more than 0.030 to 0.048%; S: 0.025% or less; Al: 0.005 to 0.20%; N: 0.010% or less; Ti: 0.005 to 0.040%; Nb: 0.005 to 0.060%; and B: 0.0005 to 0.0030%, with the balance being Fe and impurities, satisfying Formula (1) to (4). A galvannealed layer contains 7 to 15 mass % of Fe. 25×P+4×Si?3.6??(1) B?X1?0.0005??(2) C?(12/93)×Nb?X2??0.
    Type: Application
    Filed: August 22, 2016
    Publication date: September 13, 2018
    Inventors: Masaharu OKA, Nobusato KOJIMA, Tetsuya OKADA
  • Patent number: 9702031
    Abstract: The present invention provides a bake-hardenable high-strength cold-rolled steel sheet having excellent bake hardenability, cold aging resistance, and deep-drawability, and reduced planar anisotropy, containing chemical components in % by mass of: C: 0.0010% to 0.0040%, Si: 0.005% to 0.05%, Mn: 0.1% to 0.8%, P: 0.01% to 0.07%, S: 0.001% to 0.01%, Al: 0.01% to 0.08%, N: 0.0010% to 0.0050%, Nb: 0.002% to 0.020%, and Mo: 0.005% to 0.050%, a value of [Mn %]/[P %] being in the range of 1.6 to 45, where [Mn %] is an amount of Mn and [P %] is an amount of P, an amount of C in solid solution obtained from [C %]?(12/93)×[Nb %] being in the range of 0.0005% to 0.
    Type: Grant
    Filed: April 27, 2011
    Date of Patent: July 11, 2017
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Satoshi Akamatsu, Masaharu Oka
  • Publication number: 20160075109
    Abstract: A galvanized steel sheet according to the present invention includes a steel sheet and a galvanizing layer which is formed on a surface of the steel sheet. The steel sheet includes as a chemical component, by mass %, C: more than 0.100% to 0.500%, Si: 0.0001% to less than 0.20%, Mn: more than 0.20% to 3.00%, Al: 3.0% to 10.0%, N: 0.0030% to 0.0100%, Ti: more than 0.100% to 1.000%, P: 0.00001% to 0.0200%, S: 0.00001% to 0.0100% and a remainder including Fe and impurities. The galvanizing layer includes as a chemical composition, by mass %, Fe: 0.01% to 15% and a remainder including Zn and impurities. The galvanized steel sheet has a specific gravity of 5.5 to less than 7.5.
    Type: Application
    Filed: April 28, 2014
    Publication date: March 17, 2016
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Masaharu OKA, Nobuhiro FUJITA, Manabu TAKAHASHI, Riki OKAMOTO, Kenichiroh MATSUMURA
  • Publication number: 20160040273
    Abstract: A steel sheet including, by mass %, C: more than 0.100% and 0.500% or less, Si: 0.0001% or more and less than 0.20%, Mn: more than 0.20% and 0.50% or less, Al: 3.0% or more and 10.0% or less, N: 0.0030% or more and 0.0100% or less, Ti: more than 0.100% and 1.000% or less, P: 0.00001% or more and 0.0200% or less, S: 0.00001% or more and 0.0100% or less, and a remainder including Fe and impurities, in which a sum of a C content and a Ti content satisfies 0.200<C+Ti?1.500 by mass %, a product of an Al content and an Si content satisfies Al×Si?0.8 by mass %, and a specific gravity is 5.5 to less than 7.5.
    Type: Application
    Filed: April 28, 2014
    Publication date: February 11, 2016
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Masaharu OKA, Nobuhiro FUJITA, Manabu TAKAHASHI, Riki OKAMOTO, Chisato WAKABAYASHI
  • Publication number: 20130240094
    Abstract: The present invention provides a bake-hardenable high-strength cold-rolled steel sheet having excellent bake hardenability, cold aging resistance, and deep-drawability, and reduced planar anisotropy, containing chemical components in % by mass of: C: 0.0010% to 0.0040%, Si: 0.005% to 0.05%, Mn: 0.1% to 0.8%, P: 0.01% to 0.07%, S: 0.001% to 0.01%, Al: 0.01% to 0.08%, N: 0.0010% to 0.0050%, Nb: 0.002% to 0.020%, and Mo: 0.005% to 0.050%, a value of [Mn %]/[P %] being in the range of 1.6 to 45, where [Mn %] is an amount of Mn and [P %] is an amount of P, an amount of C in solid solution obtained from [C %]?(12/93)×[Nb %] being in the range of 0.0005% to 0.
    Type: Application
    Filed: April 27, 2011
    Publication date: September 19, 2013
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Satoshi Akamatsu, Masaharu Oka
  • Patent number: 8500924
    Abstract: A high-strength steel plate includes the following composition: 0.18 to 0.23 mass % of C; 0.1 to 0.5 mass % of Si; 1.0 to 2.0 mass % of Mn; 0.020 mass % or less of P; 0.010 mass % or less of S; greater than 0.5 mass % and equal to or less than 3.0 mass % of Cu, 0.25 to 2.0 mass % of Ni; 0.003 to 0.10 mass % of Nb; 0.05 to 0.15 mass % of Al; 0.0003 to 0.0030 mass % of B; 0.006 mass % or less of N; and a balance composed of Fe and inevitable impurities. A weld crack sensitivity index Pcm of the high-strength steel plate is calculated by Pcm=[C]+[Si]/30+[Mn]/20+[Cu]/20+[Ni]/60+[Cr]/20+[Mo]/15+[V]/10+5[B], and is 0.39 mass % or less. The Ac3 transformation point is equal to or less than 850° C., the percentage value of a martensite structure is equal to or greater than 90%, the yield strength is equal to or greater than 1300 MPa, and the tensile strength is equal to or greater than 1400 MPa and equal to or less than 1650 MPa.
    Type: Grant
    Filed: October 13, 2009
    Date of Patent: August 6, 2013
    Assignee: Nippon Steel & Sumitomo Metal Corporation
    Inventors: Tatsuya Kumagai, Akira Usami, Masaharu Oka
  • Patent number: 8059214
    Abstract: Fluorescent tubes are arranged such that their arrangement spaces gradually become wider in central area than in edge areas, fluorescent tubes located in the vicinity of the central area of an arrangement direction are bent into chevron-shapes such that the central parts of the longitudinal directions of the fluorescent tubes become crests which provide access to a diffusion plate, respective two adjacent fluorescent tubes which are straight tubes are connected to one another, thereby constituting pseudo U-shaped tubes, and an AC power is supplied through terminals lined up along one side of a direct-type backlight device. A reflector plate is bent so as to match with the curvature of the bent fluorescent tubes, and is formed with a protrusion which allows the fluorescent tubes located in the vicinity of the central area of the arrangement direction to be raised so as to protrude toward a diffusion plate.
    Type: Grant
    Filed: March 26, 2007
    Date of Patent: November 15, 2011
    Assignee: Funai Electric Co., Ltd.
    Inventor: Masaharu Oka
  • Publication number: 20110253271
    Abstract: A high-strength steel plate includes the following composition: 0.18 to 0.23 mass % of C; 0.1 to 0.5 mass % of Si; 1.0 to 2.0 mass % of Mn; 0.020 mass % or less of P; 0.010 mass % or less of S; greater than 0.5 mass % and equal to or less than 3.0 mass % of Cu, 0.25 to 2.0 mass % of Ni; 0.003 to 0.10 mass % of Nb; 0.05 to 0.15 mass % of Al; 0.0003 to 0.0030 mass % of B; 0.006 mass % or less of N; and a balance composed of Fe and inevitable impurities. A weld crack sensitivity index Pcm of the high-strength steel plate is calculated by Pcm=[C]+[Si]/30+[Mn]/20+[Cu]/20+[Ni]/60+[Cr]/20+[Mo]/15+[V]/10+5[B], and is 0.39 mass % or less. The Ac3 transformation point is equal to or less than 850° C., the percentage value of a martensite structure is equal to or greater than 90%, the yield strength is equal to or greater than 1300 MPa, and the tensile strength is equal to or greater than 1400 MPa and equal to or less than 1650 MPa.
    Type: Application
    Filed: October 13, 2009
    Publication date: October 20, 2011
    Inventors: Tatsuya Kumagai, Akira Usami, Masaharu Oka
  • Patent number: 7674004
    Abstract: Cold cathode fluorescent tubes of the first group are aligned widthwise in one side of an enclosure which is divided into two areas at a centerline running widthwise. Cold cathode fluorescent tubes of the second group are aligned widthwise in the other side of the enclosure. All of the cold cathode fluorescent tubes are symmetrically-placed with respect to the centerline running widthwise. The cold cathode fluorescent tubes positioned outside widthwise are inclined at ?2 so that the distance between each of the tubes and the aperture plane gradually decreases lengthwise from an edge toward the center of the enclosure. The cold cathode fluorescent tubes positioned inside widthwise are inclined at ?1 so that the distance between each of the tubes and the aperture plane gradually decreases lengthwise from an edge toward the center of the enclosure. The inclined angle ?1 is made greater than the inclined angle ?2.
    Type: Grant
    Filed: December 20, 2006
    Date of Patent: March 9, 2010
    Assignee: Funai Electric Co., Ltd.
    Inventor: Masaharu Oka
  • Patent number: 7426022
    Abstract: A brightness measurement apparatus which includes a placement unit on which an object to be measured is placed, a measurement unit for measuring brightness or chromaticity from an upper surface of the object placed on the placement unit, a placement unit moving mechanism for moving the placement unit in an x-axis direction, and a measurement unit moving mechanism for moving the measurement unit in a y-axis direction orthogonal to the x-axis direction.
    Type: Grant
    Filed: November 27, 2006
    Date of Patent: September 16, 2008
    Assignee: Funai Electric Co., Ltd.
    Inventor: Masaharu Oka
  • Publication number: 20070222905
    Abstract: Fluorescent tubes are arranged such that their arrangement spaces gradually become wider in central area than in edge areas, fluorescent tubes located in the vicinity of the central area of an arrangement direction are bent into chevron-shapes such that the central parts of the longitudinal directions of the fluorescent tubes become crests which provide access to a diffusion plate, respective two adjacent fluorescent tubes which are straight tubes are connected to one another, thereby constituting pseudo U-shaped tubes, and an AC power is supplied through terminals lined up along one side of a direct-type backlight device. A reflector plate is bent so as to match with the curvature of the bent fluorescent tubes, and is formed with a protrusion which allows the fluorescent tubes located in the vicinity of the central area of the arrangement direction to be raised so as to protrude toward a diffusion plate.
    Type: Application
    Filed: March 26, 2007
    Publication date: September 27, 2007
    Applicant: Funai Electric Co., Ltd.
    Inventor: Masaharu Oka
  • Patent number: 7236216
    Abstract: A liquid crystal module includes an annular casing molded from resin, a diffuser panel attached to a front side of the casing, a liquid crystal cell disposed on the front side of the casing so as to close a front side of the diffuser panel, and a substrate attached to a rear side of the casing. The casing has a through hole that is formed on an outer peripheral portion of the casing, and a catch formed at a front end of the through hole. The diffuser panel closes the through hole from the front side of the casing. The substrate is attached to the rear side of the casing to close the through hole from the rear side. It is possible to prevent outside dust from entering into the space between the liquid crystal panel and the diffuser plate through the through hole.
    Type: Grant
    Filed: July 25, 2005
    Date of Patent: June 26, 2007
    Assignee: Funai Electric Co., Ltd.
    Inventor: Masaharu Oka
  • Publication number: 20070139912
    Abstract: Cold cathode fluorescent tubes of the first group are aligned widthwise in one side of an enclosure which is divided into two areas at a centerline running widthwise. Cold cathode fluorescent tubes of the second group are aligned widthwise in the other side of the enclosure. All of the cold cathode fluorescent tubes are symmetrically-placed with respect to the centerline running widthwise. The cold cathode fluorescent tubes positioned outside widthwise are inclined at ?2 so that the distance between each of the tubes and the aperture plane gradually decreases lengthwise from an edge toward the center of the enclosure. The cold cathode fluorescent tubes positioned inside widthwise are inclined at ?1 so that the distance between each of the tubes and the aperture plane gradually decreases lengthwise from an edge toward the center of the enclosure. The inclined angle ?1 is made greater than the inclined angle ?2.
    Type: Application
    Filed: December 20, 2006
    Publication date: June 21, 2007
    Applicant: FUNAI ELECTRIC CO., LTD.
    Inventor: Masaharu Oka
  • Publication number: 20070132986
    Abstract: A brightness measurement apparatus which includes a placement unit on which an object to be measured is placed, a measurement unit for measuring brightness or chromaticity from an upper surface of the object placed on the placement unit, a placement unit moving mechanism for moving the placement unit in an x-axis direction, and a measurement unit moving mechanism for moving the measurement unit in a y-axis direction orthogonal to the x-axis direction.
    Type: Application
    Filed: November 27, 2006
    Publication date: June 14, 2007
    Applicant: Funai Electric Co., Ltd.
    Inventor: Masaharu Oka
  • Publication number: 20060023141
    Abstract: A liquid crystal module includes an annular casing molded from resin, a diffuser panel attached to a front side of the casing, a liquid crystal cell disposed on the front side of the casing so as to close a front side of the diffuser panel, and a substrate attached to a rear side of the casing. The casing has a through hole that is formed on an outer peripheral portion of the casing, and a catch formed at a front end of the through hole. The diffuser panel closes the through hole from the front side of the casing. The substrate is attached to the rear side of the casing to close the through hole from the rear side. It is possible to prevent outside dust from entering into the space between the liquid crystal panel and the diffuser plate through the through hole.
    Type: Application
    Filed: July 25, 2005
    Publication date: February 2, 2006
    Applicant: FUNAI ELECTRIC CO., LTD.
    Inventor: Masaharu Oka
  • Publication number: 20050219861
    Abstract: Two U-shaped CCFLs (Cold Cathode Fluorescent Lamps) are respectively placed symmetrically up and down with respect to a transverse plane, as a plane of symmetry, passing through a center in the vertical direction of a display screen of a liquid crystal panel. These two U-shaped CCFLs are mounted in a backlight unit in a manner that the mounting pitch of the two U-shaped CCFLs is shorter than the center-to-center distance between parallel tube segments in each U-shaped CCFL. Thereby, the backlight unit for e.g. a 15 inch or larger liquid crystal television can secure practical brightness at a central portion in the vertical direction of the display screen by using two U-shaped CCFLs. This makes it possible for the backlight to reduce the number of CCFLs and the number of accompanying components (e.g. inverter circuits), thereby reducing the cost of the entire backlight unit and improving the work efficiency in assembling the backlight unit.
    Type: Application
    Filed: March 29, 2005
    Publication date: October 6, 2005
    Applicant: Funai Electric Co., Ltd.
    Inventor: Masaharu Oka