Patents by Inventor Hitoshi Ishikawa

Hitoshi Ishikawa 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: 11251424
    Abstract: A purpose of one embodiment of the present invention is to provide a lithium ion secondary battery which has improved cycle characteristics and comprises a Si material in the negative electrode. The lithium ion secondary battery according to the present invention comprises a negative electrode comprising a negative electrode active material, a positive electrode comprising a positive electrode active material and an electrolyte solution, wherein the negative electrode active material comprises a Si material, and a ratio (Ia/Ib) of a peak intensity (Ia) at 290 eV to a peak intensity (Ib) at 285 eV is 0.7 or more in a C1s spectrum obtained by surface analysis of the negative electrode by X-ray photoelectron spectroscopy.
    Type: Grant
    Filed: May 17, 2018
    Date of Patent: February 15, 2022
    Assignee: NEC CORPORATION
    Inventors: Suguru Tamai, Hitoshi Ishikawa
  • Patent number: 11154937
    Abstract: A tool holder includes a tubular body having a shank on a first axial end portion, a tool gripping portion on a second axial end portion, and an elastic segment interposed between the shank and the tool gripping portion in the axial direction of the body. The elastic segment is more elastically deformable along the axial direction and around a circumferential direction of the tubular body than the shank and the tool gripping portion owing to a plurality of voids that extend through the elastic segment from an outer peripheral side of the tubular body to an inner peripheral side of the tubular body. Each of the voids includes segments that extend around the circumferential direction and along the axial direction of the tubular body.
    Type: Grant
    Filed: May 11, 2018
    Date of Patent: October 26, 2021
    Assignee: NT TOOL CORPORATION
    Inventor: Hitoshi Ishikawa
  • Publication number: 20210151749
    Abstract: A purpose of one embodiment of the present invention is to provide a lithium ion secondary battery which has improved cycle characteristics and comprises a Si material in the negative electrode. The lithium ion secondary battery according to the present invention comprises a negative electrode comprising a negative electrode active material, a positive electrode comprising a positive electrode active material and an electrolyte solution, wherein the negative electrode active material comprises a Si material, and a ratio (Ia/Ib) of a peak intensity (Ia) at 290 eV to a peak intensity (Ib) at 285 eV is 0.7 or more in a C1s spectrum obtained by surface analysis of the negative electrode by X-ray photoelectron spectroscopy.
    Type: Application
    Filed: May 17, 2018
    Publication date: May 20, 2021
    Applicant: NEC CORPORATION
    Inventors: Suguru TAMAI, Hitoshi ISHIKAWA
  • Patent number: 10978737
    Abstract: The present invention relates to an electrolyte solution comprising a supporting salt, a nonaqueous solvent containing a compound having a viscosity of 1.0 mPa-s or less in an amount of more than 50% by volume in the nonaqueous solvent, and a halogenated cyclic acid anhydride. According to the present invention, an electrolyte solution capable of suppressing gas generation is provided.
    Type: Grant
    Filed: June 23, 2015
    Date of Patent: April 13, 2021
    Assignee: NEC Corporation
    Inventors: Noboru Yoshida, Ikiko Shimanuki, Shinsaku Saitho, Hitoshi Ishikawa
  • Publication number: 20200365899
    Abstract: An object of the present invention is to provide a lithium ion secondary battery having a high energy density and improved cycle characteristics. The present invention is related to an electrode for a power storage device comprising a negative electrode mixture layer comprising: (a) a negative electrode active material (42-2) comprising 1% or more of a material comprising Si as a constituent element; (b) a first polymer (42-1) coating the negative electrode active material and comprising vinylidene fluoride as a monomer unit; and (c) a negative electrode binder (42-3) comprising a second polymer that has a molecular weight of 80,000 or more and comprises at least one monomer unit selected from the group consisting of acrylic acid, acrylate salt, methacrylic acid, and methacrylate salt.
    Type: Application
    Filed: August 14, 2018
    Publication date: November 19, 2020
    Applicant: NEC CORPORATION
    Inventors: Suguru TAMAI, Hitoshi ISHIKAWA
  • Patent number: 10840551
    Abstract: The present invention relates to a lithium secondary battery having a positive electrode comprising a positive electrode active material capable of absorbing and releasing lithium ions, a negative electrode comprising a negative electrode active material capable of absorbing and releasing lithium ions, and an electrolyte solution, wherein a positive electrode surface detection component comprises at least one negative secondary ion peak selected from CH3S2O6? and CHS2O4?, and further comprises a negative secondary ion peak of SO3—, wherein the positive electrode surface detection component is detected when a primary ion is irradiated on the surface of the positive electrode active material by a Time-of-Flight Secondary Ion Mass Spectrometry (TOF-SIMS) method. According to the present invention, it is possible to provide a lithium secondary battery having excellent cycle characteristics.
    Type: Grant
    Filed: August 4, 2015
    Date of Patent: November 17, 2020
    Assignee: NEC Corporation
    Inventors: Ikiko Shimanuki, Hitoshi Ishikawa, Noboru Yoshida, Daisuke Kawasaki
  • Patent number: 10824775
    Abstract: Methods and apparatus provide for, at each of plural calculation timings, associating pieces of position information indicating the positions of objects in a virtual space at the calculation timing with leaves and creates a complete binary tree in which position information reflecting pieces of the position information of child nodes is associated with an internal node, and a node shuffling section that shuffles 2·2n (n?1) child nodes regarding each group of 2n nodes on the basis of the position information associated with each of the 2·2n child nodes belonging to the 2n nodes in each layer sequentially from the immediately-upper layer of the lowermost layer in the complete binary tree; and carrying out collision determination between objects by using the complete binary tree resulting from the shuffling by the node shuffling section.
    Type: Grant
    Filed: April 25, 2014
    Date of Patent: November 3, 2020
    Assignee: Sony Interactive Entertainment Inc.
    Inventors: Hitoshi Ishikawa, Hiroshi Matsuike, Koichi Yoshida
  • Publication number: 20200298321
    Abstract: A tool holder includes a tubular body having a shank on a first axial end portion, a tool gripping portion on a second axial end portion, and an elastic segment interposed between the shank and the tool gripping portion in the axial direction of the body. The elastic segment is more elastically deformable along the axial direction and around a circumferential direction of the tubular body than the shank and the tool gripping portion owing to a plurality of voids that extend through the elastic segment from an outer peripheral side of the tubular body to an inner peripheral side of the tubular body. Each of the voids includes segments that extend around the circumferential direction and along the axial direction of the tubular body.
    Type: Application
    Filed: May 11, 2018
    Publication date: September 24, 2020
    Inventor: Hitoshi ISHIKAWA
  • Patent number: 10756337
    Abstract: When the particle size of a silicon material used for a negative electrode active material are small, a large surface area thereof easily causes a side reaction between the active material and an electrolyte solvent to occur, and the cycle characteristics of a lithium ion secondary battery decrease. In order to improve the cycle characteristics, a lithium ion secondary battery according to the present invention is characterized in comprising a negative electrode comprising a material comprising silicon as a constituent element and a polyacrylic acid, and an electrolyte solution comprising a fluoroethylene carbonate, wherein the 50% particle size of the material comprising silicon as a constituent element is 2 ?m or less.
    Type: Grant
    Filed: November 29, 2016
    Date of Patent: August 25, 2020
    Assignee: NEC CORPORATION
    Inventors: Ikiko Shimanuki, Suguru Tamai, Daisuke Kawasaki, Hitoshi Ishikawa
  • Patent number: 10711652
    Abstract: Provided are a main steam piping connecting a steam generator and a steam turbine, a bypass piping branched from the main steam piping and bypassing the steam turbine, a bypass valve provided in the bypass piping, a warming piping branched from the bypass valve, a warming valve provided in the warming piping, and a control system. The control system controls the warming valve in such a manner that bypass valve temperature t is brought to within a temperature range satisfying the three conditions: (1) being equal to or higher than the saturated temperature of steam flowing into the bypass valve; (2) having a temperature difference from the flowing-in steam of equal to or less than an allowable value; and (3) being equal to or lower than a temperature at which the formation rate of steam oxidation scale rises.
    Type: Grant
    Filed: April 3, 2017
    Date of Patent: July 14, 2020
    Assignee: MITSUBISHI HITACHI POWER SYSTEMS, LTD.
    Inventors: Yusuke Manabe, Hitoshi Ishikawa
  • Patent number: 10566661
    Abstract: The present invention relates to an electrolytic solution comprising a cyclic disulfonic acid ester represented by the specific formula and a cyclic dicarboxylic acid ester represented by the specific formula, and the secondary battery using the same. According to the present invention, the electrolytic solution which can improve a cycle characteristics in a secondary battery and a secondary battery using the same can be provided.
    Type: Grant
    Filed: June 16, 2015
    Date of Patent: February 18, 2020
    Assignee: NEC Corporation
    Inventors: Ikiko Shimanuki, Hitoshi Ishikawa, Noboru Yoshida
  • Patent number: 10361464
    Abstract: The present invention relates to an electrolytic solution comprising a cyclic dicarboxylic acid ester represented by the specific formula, and the secondary battery comprising the same. According to the present invention, the electrolytic solution comprising an additive which can improve a characteristics in a secondary battery and a secondary battery comprising the same can be provided.
    Type: Grant
    Filed: June 16, 2015
    Date of Patent: July 23, 2019
    Assignee: NEC Corporation
    Inventors: Noboru Yoshida, Ikiko Shimanuki, Shinsaku Saitho, Hitoshi Ishikawa
  • Publication number: 20190173123
    Abstract: A lithium ion secondary battery having high energy density and excellent cycle characteristics is provided. The present invention relates to a lithium ion secondary battery comprising a negative electrode comprising a negative electrode active material comprising more than 25% by weight of a silicon alloy and a non-aqueous electrolyte solution comprising more than 10% by weight of a compound represented by LiN(SO2CnF2n+1)2 (wherein n is an integer of 0 or more) and 10% by weight or more of fluoroethylene carbonate (FEC).
    Type: Application
    Filed: May 23, 2017
    Publication date: June 6, 2019
    Applicant: NEC CORPORATION
    Inventors: Ikiko SHIMANUKI, Daisuke KAWASAKI, Hitoshi ISHIKAWA, Suguru TAMAI
  • Patent number: 10224568
    Abstract: It is an object of the present invention to provide an electrolytic solution capable of suppressing gas generation. The present exemplary embodiment is an electrolytic solution comprising a supporting salt, a nonaqueous solvent that dissolves the supporting salt, a cyclic sulfonic acid ester compound represented by predetermined formula (1), and an acid anhydride. According to the exemplary embodiment, an electrolytic solution capable of suppressing gas generation can be provided.
    Type: Grant
    Filed: July 11, 2014
    Date of Patent: March 5, 2019
    Assignee: NEC Corporation
    Inventors: Noboru Yoshida, Shinsaku Saitho, Kazuaki Matsumoto, Ikiko Shimanuki, Daisuke Kawasaki, Yuukou Katou, Hitoshi Ishikawa
  • Patent number: 10211451
    Abstract: The present invention relates to a negative electrode for a lithium ion secondary battery, the negative electrode containing a negative electrode active material containing a first carbon and a second carbon, in which the first carbon is spherical graphite, the second carbon is massive graphite, and the sulfur concentration in the first carbon (Sx) and the sulfur concentration in the second carbon (Sy) are each independently 0 ppm or more and 300 ppm or less.
    Type: Grant
    Filed: January 10, 2014
    Date of Patent: February 19, 2019
    Assignee: NEC CORPORATION
    Inventors: Takeshi Azami, Hitoshi Ishikawa
  • Publication number: 20180358610
    Abstract: When the particle size of a silicon material used for a negative electrode active material are small, a large surface area thereof easily causes a side reaction between the active material and an electrolyte solvent to occur, and the cycle characteristics of a lithium ion secondary battery decrease. In order to improve the cycle characteristics, a lithium ion secondary battery according to the present invention is characterized in comprising a negative electrode comprising a material comprising silicon as a constituent element and a polyacrylic acid, and an electrolyte solution comprising a fluoroethylene carbonate, wherein the 50% particle size of the material comprising silicon as a constituent element is 2 ?m or less.
    Type: Application
    Filed: November 29, 2016
    Publication date: December 13, 2018
    Applicant: NEC Corporation
    Inventors: Ikiko SHIMANUKI, Suguru TAMAI, Daisuke KAWASAKI, Hitoshi ISHIKAWA
  • Patent number: 10089420
    Abstract: A simulation apparatus which simulates a position of each of plural objects, which move in a virtual space together with time, at each of plural time points of calculation. The apparatus includes: an object pair information acquisition unit acquiring plural pieces of information of object pairs each including, as components thereof, two objects which contact with each other at each of the plural time points of calculation; an allocation unit allocating, at each of the plural time points of calculation, each of the plural object pairs to one of plural groups such that two or more object pairs which include a common object do not belong to the same group; and a calculation unit calculating, at each of the plural time points of calculation, an influence of contact of two objects included in each of the plural object pairs upon positions of the two objects.
    Type: Grant
    Filed: December 9, 2014
    Date of Patent: October 2, 2018
    Assignee: Sony Interactive Entertainment Inc.
    Inventors: Hitoshi Ishikawa, Hiroshi Matsuike, Koichi Yoshida
  • Patent number: 9991561
    Abstract: The present invention provides a lithium ion secondary battery comprising: a positive electrode; a negative electrode comprising a negative electrode active material comprising at least one carbon material selected from the group consisting of a natural graphite, an artificial graphite, a non-graphitizable carbon and a graphitizable carbon; and an electrolyte solution comprising a specific cyclic disulfonate ester compound and an acid anhydride.
    Type: Grant
    Filed: August 28, 2014
    Date of Patent: June 5, 2018
    Assignee: NEC Corporation
    Inventors: Takeshi Azami, Hitoshi Ishikawa, Noboru Yoshida, Ikiko Shimanuki, Kazuaki Matsumoto, Makihiro Otohata
  • Patent number: 9988730
    Abstract: In a substrate like a printed circuit board comprising an insulator and a copper layer laminated on part of the insulator, said insulator outer surface and said copper layer outer surface are simultaneously subjected to a process (1) comprising treatment with an alkali metal hydroxide solution, a process (2) comprising treatment with an alkaline aqueous solution containing an aliphatic amine, a process (3) comprising treatment with an alkaline aqueous solution having a permanganate concentration of 0.3 to 3.5 wt % and a pH of 8 to 11, a process (4) comprising treatment with an acidic microemulsion aqueous solution containing a thiophene compound and an alkali metal salt of polystyrenesulphonic acid, and a process (5) comprising copper electroplating, which are implemented sequentially.
    Type: Grant
    Filed: March 12, 2015
    Date of Patent: June 5, 2018
    Assignee: Atotech Deutschland GmbH
    Inventors: Tadahiro Nishigawa, Jun Higuchi, Hitoshi Ishikawa
  • Patent number: 9953116
    Abstract: A simulation apparatus which simulates a position of each of a plurality of objects, which move in a virtual space together with time, at each of a plural calculation time is disclosed. The apparatus includes: an object connection block for applying, to each object of each three or more objects contacting with each other at each of the plural calculation time points, a pointer value indicative of a contact destination object with which the object is in contact determining one of the three or more objects as a terminal end to connect the objects; and a pointer value updating block for repeating a pointer value updating process, by which the pointer value of each object is updated to the pointer value of the contact destination object indicated by the pointer value until the pointer values of all of the objects come to indicate the object of the terminal end.
    Type: Grant
    Filed: December 9, 2014
    Date of Patent: April 24, 2018
    Assignee: Sony Interactive Entertainment Inc.
    Inventors: Hitoshi Ishikawa, Hiroshi Matsuike, Koichi Yoshida