Patents by Inventor Yuji Nihei

Yuji Nihei 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: 11569504
    Abstract: The production method is a method for producing a positive electrode active material for a lithium ion secondary battery which contains at least nickel and lithium, the method including: a firing process in which a mixture of a nickel compound powder and a lithium compound powder is fired; and a water washing process in which a lithium-nickel composite oxide powder obtained in the firing process is washed with water, wherein the firing process is performed under conditions such that a value obtained by dividing a ratio of an amount-of-substance of lithium to a total amount-of-substance of transition metals other than lithium in the lithium-nickel composite oxide powder after the washing with water by a ratio of an amount-of-substance of lithium to a total amount-of-substance of transition metals other than lithium in the lithium-nickel composite oxide powder before the washing with water exceeds 0.95.
    Type: Grant
    Filed: October 22, 2018
    Date of Patent: January 31, 2023
    Assignee: SUMITOMO METAL MINING CO., LTD.
    Inventors: Yasutaka Kamata, Yuji Kawakami, Tomomichi Nihei
  • Publication number: 20160138139
    Abstract: A graphite spheroidizing agent containing: 30-80 wt % of Si; Mg; RE (rare earth element) which comprises Ce with a purity level of 80-100 wt % or La with a purity level of 80-100 wt %; Ca; and Al is used. The graphite spheroidizing agent is added so as to satisfy the conditions that an amount of RE equivalent to 0.001-0.009 wt % of the total weight of the molten metal, an amount of Ca equivalent to 0.001-0.02 wt % of the total weight of the molten metal, and an amount of Al equivalent to 0.001-0.02 wt % of the total weight of the molten metal are added to the molten metal, and that the molten metal contains 0.03-0.07 wt % of Mg after the graphite spheroidizing treatment. It is possible to suppress crystallization of chunky graphite in a thick section of spheroidal graphite cast iron and deterioration of mechanical properties, with a low cost.
    Type: Application
    Filed: September 5, 2014
    Publication date: May 19, 2016
    Inventors: Ryosuke FUJIMOTO, Shuhei HOMMA, Takashi YOKOYAMA, Yuji NIHEI, Toshiaki OZEKI
  • Patent number: 8641962
    Abstract: A highly stiff and highly damping cast iron containing C and Si in an amount of 3.30 to 3.95% in terms of carbon equivalent shown in the following equation (1), Mn: 0.25 to 1.0%, P: 0.04% or less, S: 0.03% or less, Al: 3 to 7%, and Sn: 0.03 to 0.20%, balance being Fe and unavoidable impurities: Carbon equivalent (%)=C(%)+(1/3)×Si(%)??(1).
    Type: Grant
    Filed: August 13, 2009
    Date of Patent: February 4, 2014
    Assignee: Toshiba Kikai Kabushiki Kaisha
    Inventors: Sakae Takahashi, Naoki Sakamoto, Ryousuke Fujimoto, Ryousuke Ogawa, Yuji Nihei
  • Patent number: 8159212
    Abstract: To disclose a magnetic encoder being subjected to only small gap variation between a magnetic sensor element and a magnetic medium and readily assembled, and having a smaller number of components, high sliding resistance, and high stability against outside force, such as shock or the like. The magnetic sensor holding mechanism has a swirling spring plate structure having elasticity with respect to rotation around a rotation axis in a reciprocative slide relative movement direction, elasticity with respect to rotation around a rotation axis in a direction perpendicular to the reciprocative relative movement direction and in parallel to the magnetic medium, and elasticity in the direction perpendicular to the sensor element. A load between 50 mN and 80 mN is applied to press onto the magnetic medium.
    Type: Grant
    Filed: February 21, 2008
    Date of Patent: April 17, 2012
    Assignee: Hitachi Metals, Ltd.
    Inventors: Yasunori Abe, Yuji Nihei, Shinji Furuichi, Yasuko Furuichi, legal representative
  • Patent number: 7990139
    Abstract: Disclosed is a small-sized two-axis magnetic field sensor having a function to cause a magnetic field canceling an external offset magnetic field. The two-axis magnetic field sensor contains a plane coil disposed on a plane and four sets of magneto-resistance element pairs on a plane parallel to the plane coil. The plane coil includes at least two pairs of parallel conductors, and two magneto-resistance elements cross only a single conductor of the coil. A current for canceling the external offset magnetic field is determined in advance, and while a DC current that causes total magnetic fields of biasing magnetic fields plus a magnetic field for canceling the external offset magnetic field flows through the coil, intermediate potential outputs from the magneto-resistance element pairs are detected to measure a magnetic field direction, such as geo-magnetism.
    Type: Grant
    Filed: March 22, 2007
    Date of Patent: August 2, 2011
    Assignee: Hitachi Metals, Ltd.
    Inventors: Yasunori Abe, Tomoki Ono, Yuji Nihei
  • Publication number: 20100141242
    Abstract: To disclose a magnetic encoder being subjected to only small gap variation between a magnetic sensor element and a magnetic medium and readily assembled, and having a smaller number of components, high sliding resistance, and high stability against outside force, such as shock or the like. The magnetic sensor holding mechanism has a swirling spring plate structure having elasticity with respect to rotation around a rotation axis in a reciprocative slide relative movement direction, elasticity with respect to rotation around a rotation axis in a direction perpendicular to the reciprocative relative movement direction and in parallel to the magnetic medium, and elasticity in the direction perpendicular to the sensor element. A load between 50 mN and 80 mN is applied to press onto the magnetic medium.
    Type: Application
    Filed: February 21, 2008
    Publication date: June 10, 2010
    Applicant: Hitachi Metals Ltd.
    Inventors: Yasunori Abe, Yuji Nihei, Shinji Furuichi, Yasuko Furuichi
  • Publication number: 20090297386
    Abstract: A highly stiff and highly damping cast iron containing C and Si in an amount of 3.30 to 3.95% in terms of carbon equivalent shown in the following equation (1), Mn: 0.25 to 1.0%, P: 0.04% or less, S: 0.03% or less, Al: 3 to 7%, and Sn: 0.03 to 0.
    Type: Application
    Filed: August 13, 2009
    Publication date: December 3, 2009
    Applicant: TOSHIBA KIKAI KABUSHIKI KAISHA
    Inventors: Sakae Takahashi, Naoki Sakamoto, Ryousuke Fujimoto, Ryousuke Ogawa, Yuji Nihei
  • Publication number: 20090108841
    Abstract: Disclosed is a small-sized two-axis magnetic field sensor having a function to cause a magnetic field canceling an external offset magnetic field. The two-axis magnetic field sensor contains a plane coil disposed on a plane and four sets of magneto-resistance element pairs on a plane parallel to the plane coil. The plane coil includes at least two pairs of parallel conductors, and two magneto-resistance elements cross only a single conductor of the coil. A current for canceling the external offset magnetic field is determined in advance, and while a DC current that causes total magnetic fields of biasing magnetic fields plus a magnetic field for canceling the external offset magnetic field flows through the coil, intermediate potential outputs from the magneto-resistance element pairs are detected to measure a magnetic field direction, such as geo-magnetism.
    Type: Application
    Filed: March 22, 2007
    Publication date: April 30, 2009
    Inventors: Yasunori Abe, Tomoki Ono, Yuji Nihei
  • Patent number: 7378839
    Abstract: A magnetic encoder having a magnetic sensor composed of SVGMR elements, in which a signal output with a half of a cycle of magnetic regions on a magnetic medium. The magnetic encoder comprises the magnetic medium, on which first magnetic regions and second magnetic regions are oppositely magnetized along the medium extending and disposed successively and alternately with each other, and the magnetic sensor that has an even number of SVGMR elements and is movable relatively to the medium along the medium extending. Magnetizations of pinned magnetization layers of all the SVGMR elements are directed in a same direction along the medium extending.
    Type: Grant
    Filed: September 18, 2006
    Date of Patent: May 27, 2008
    Assignee: Hitachi Metals, Ltd.
    Inventors: Yasunori Abe, Yuji Nihei
  • Patent number: 7339369
    Abstract: A magnetic encoder having a magnetic sensor composed of SVGMR elements, in which a signal output with a cycle equal to or less than a third of a cycle of magnetic patterns on a magnetic medium. The magnetic encoder comprises the magnetic medium, on which first magnetic regions and second magnetic regions are oppositely magnetized along the medium extending and disposed successively and alternately with each other, and the sensor that has three SVGMR elements or more and is movable relatively to the medium along the medium extending. Magnetizations of pinned magnetization layers of all the SVGMR elements are directed in the same direction along the medium extending.
    Type: Grant
    Filed: November 28, 2006
    Date of Patent: March 4, 2008
    Assignee: Hitachi Metals, Ltd.
    Inventors: Yuji Nihei, Yasunori Abe
  • Publication number: 20070126417
    Abstract: A magnetic encoder having a magnetic sensor composed of SVGMR elements, in which a signal output with a cycle equal to or less than a third of a cycle of magnetic patterns on a magnetic medium. The magnetic encoder comprises the magnetic medium, on which first magnetic regions and second magnetic regions are oppositely magnetized along the medium extending and disposed successively and alternately with each other, and the sensor that has three SVGMR elements or more and is movable relatively to the medium along the medium extending. Magnetizations of pinned magnetization layers of all the SVGMR elements are directed in the same direction along the medium extending.
    Type: Application
    Filed: November 28, 2006
    Publication date: June 7, 2007
    Applicant: HITACHI METALS, LTD.
    Inventors: Yuji NIHEI, Yasunori ABE
  • Publication number: 20070076329
    Abstract: A magnetic encoder having a magnetic sensor composed of SVGMR elements, in which a signal output with a half of a cycle of magnetic regions on a magnetic medium. The magnetic encoder comprises the magnetic medium, on which first magnetic regions and second magnetic regions are oppositely magnetized along the medium extending and disposed successively and alternately with each other, and the magnetic sensor that has an even number of SVGMR elements and is movable relatively to the medium along the medium extending. Magnetizations of pinned magnetization layers of all the SVGMR elements are directed in a same direction along the medium extending.
    Type: Application
    Filed: September 18, 2006
    Publication date: April 5, 2007
    Inventors: Yasunori Abe, Yuji Nihei