Patents by Inventor Shin-ichi Ohkoshi

Shin-ichi Ohkoshi 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).

  • Publication number: 20230307844
    Abstract: A radio wave absorber with which it is possible to obtain both excellent radio wave absorption characteristics in a high-frequency band and excellent heat dissipation characteristics, and a radio wave absorber formation paste suitable for use in producing the radio wave absorber. The radio wave absorber includes a composite layer made of a radio wave absorption material and a thermally conductive material, the radio wave absorption material includes one or more types of an ?-Fe2O3 crystal; and a crystal in which the crystal and the space group are identical to those of ?-Fe2O3 and a part of an Fe site of the ?-Fe2O3 is substituted with an element M other than Fe, and that is represented by the formula ?-MxFe2-xO3 in which x is greater than 0 and less than 2.
    Type: Application
    Filed: May 13, 2021
    Publication date: September 28, 2023
    Inventors: Shin-ichi OHKOSHI, Asuka NAMAI, Marie YOSHIKIYO, Masayuki HARA, Takahiro ASAI
  • Publication number: 20230301047
    Abstract: An electromagnetic wave absorbing sheet includes a metallic base and an electromagnetic wave absorption film formed on the metallic base. The electromagnetic wave absorption film contains MTC-substituted ?—Fe2O3, black titanium oxide, a conductive filler, and a resin. The MTC-substituted ?—Fe2O3 is a crystal belonging to the same space group as an ?—Fe2O3 crystal and containing Ti, Co, Fe, and at least one element selected from the group consisting of Ga, In, Al, and Rh. The proportion of the conductive filler to the electromagnetic wave absorption film is equal to or greater than 0.1% by volume and equal to or less than 10% by volume.
    Type: Application
    Filed: April 20, 2023
    Publication date: September 21, 2023
    Applicants: PANASONIC HOLDINGS CORPORATION, THE UNIVERSITY OF TOKYO
    Inventors: Keiko KASHIHARA, Rei FUJIWARA, Shin-ichi OHKOSHI, Asuka NAMAI
  • Patent number: 11574652
    Abstract: Provided is a recording device. The recording device includes: an external magnetic field application unit that is configured to apply an external magnetic field to a magnetic recording medium; a light irradiation unit that is configured to irradiate light; and a light focusing unit that is configured to focus the light from the light irradiation unit by resonating the light to generate an enhanced magnetic field in which a magnetic field of the light is enhanced, in which magnetization of the magnetic recording medium is inverted by applying the external magnetic field and the enhanced magnetic field to the magnetic recording medium.
    Type: Grant
    Filed: August 13, 2021
    Date of Patent: February 7, 2023
    Assignees: THE UNIVERSITY OF TOKYO, OSAKA UNIVERSITY, FUJIFILM Corporation
    Inventors: Shin-ichi Ohkoshi, Marie Yoshikiyo, Kenta Imoto, Kosuke Nakagawa, Asuka Namai, Hiroko Tokoro, Makoto Nakajima, Masashi Shirata, Kenji Naoi
  • Patent number: 11539141
    Abstract: A radio wave absorber includes a base member, and a radio wave absorption film formed on the base member. The radio wave absorption film includes at least MTC-substituted ?-Fe2O3 and black titanium oxide. The MTC-substituted ?-Fe2O3 is a crystal belonging to the same space group as an ?-Fe2O3 crystal and expressed by ?-MxTiyCoyFe2?2y?xO3 where M is at least one element selected from the group consisting of Ga, In, Al, and Rh, 0<x<1, and 0<y<1.
    Type: Grant
    Filed: June 25, 2018
    Date of Patent: December 27, 2022
    Assignees: PANASONIC HOLDINGS CORPORATION, THE UNIVERSITY OF TOKYO
    Inventors: Shin-ichi Ohkoshi, Asuka Namai, Seiji Nishitani, Tomohiro Kuzuu
  • Publication number: 20220375663
    Abstract: A raw material solution containing trivalent iron ions, or trivalent iron ions and ions of a metal element that partially substitutes Fe sites, and an alkaline aqueous solution for neutralizing the raw material solution are added to a reaction system to adjust the pH of the reaction system from 1.0 to 3.0 or lower. Hydroxycarboxylic acid is added to the obtained reaction solution and the pH of the reaction system is then neutralized from 7.0 to 10.0 or lower. The obtained precipitate of a substituent metal element-containing iron oxyhydroxide is coated with silicon oxide, followed by heating so as to form particles of ?-iron oxide in which Fe sites are partially substituted by other metal elements, and then, a slurry containing the particles is classified. The iron-based oxide magnetic powder has a particle shape close to a perfect sphere and is suitable for use in a magnetic recording medium.
    Type: Application
    Filed: September 29, 2020
    Publication date: November 24, 2022
    Inventors: Shin-ichi OHKOSHI, Asuka NAMAl, Hiroko TOKORO, Marie YOSHIKIYO, Kazuhiro YAMAGA, Yasuto MIYAMOTO, Yuki MINEYAMA, Kenji SAKANE, Tetsuya KAWAHITO
  • Publication number: 20220288633
    Abstract: A radio wave absorber film which is thin and exhibits excellent radio wave absorption performance; and a method for producing this radio wave absorber film. The radio wave absorber film formed on a base material layer contains a magnetic body and a binder resin in a radio wave absorption layer; and an aromatic ester-urethane copolymer is used as the binder resin. The glass transition temperature of the binder resin is 100° C. or less, and 0° C. or less.
    Type: Application
    Filed: July 30, 2020
    Publication date: September 15, 2022
    Inventors: Shin-ichi OHKOSHI, Asuka NAMAI, Marie YOSHIKIYO, Masayuki HARA, Takahiro ASAI
  • Patent number: 11401170
    Abstract: [Problem] To provide a method for producing iron based oxide magnetic powder that has a narrow particle size distribution and a small content of fine particles that do not contribute to the magnetic recording characteristics, and consequently has a narrow coercive force distribution and is suitable for the enhancement of the recording density of the magnetic recording medium. [Solution] ?-Type iron based oxide magnetic powder is obtained by a wet method, then a tetraalkylammonium salt as a surface modifier is added to a slurry containing the magnetic powder to make a concentration of 0.009 mol/kg or more and 1.0 mol/kg or less, and simultaneously to make pH of 11 or more and 14 or less, and the slurry is subjected to a dispersion treatment and then classified, so as to provide iron based oxide magnetic powder having a narrow particle size distribution and a narrow coercive force distribution.
    Type: Grant
    Filed: March 26, 2019
    Date of Patent: August 2, 2022
    Assignees: DOWA ELECTRONICS MATERIALS CO., LTD., THE UNIVERSITY OF TOKYO
    Inventors: Shin-ichi Ohkoshi, Asuka Namai, Kenji Sakane, Tetsuya Kawahito
  • Patent number: 11315595
    Abstract: The present invention provides a recording method and a recording device in which information can be easily recorded even in a magnetic recording medium using epsilon iron oxide particles having a high coercive force as a magnetic recording material. A recording device of the invention applies an external magnetic field H0 that inclines magnetization of epsilon iron oxide particles to a particle dispersion element containing epsilon iron oxide particles, and irradiates the particle dispersion element with light that excites the magnetization. Accordingly, the recording device is capable of inverting magnetization that is not capable of being inverted only by the external magnetic field, in accordance with a synergetic effect between the inclination of the magnetization and the light excitation of the magnetization.
    Type: Grant
    Filed: September 28, 2020
    Date of Patent: April 26, 2022
    Assignees: THE UNIVERSITY OF TOKYO, OSAKA UNIVERSITY, FUJIFILM Corporation
    Inventors: Shin-ichi Ohkoshi, Makoto Nakajima, Masashi Shirata, Hiroaki Doshita
  • Publication number: 20220081319
    Abstract: An iron-based oxide magnetic powder has good thermal stability and a small change in coercive force even in a high-temperature environment and is one composed of particles of ?-iron oxide in which Fe sites are partially substituted by another metal element. A production method for such an iron-based oxide magnetic powder includes allowing a phosphorus-containing ion to coexist when a precipitate of an iron hydroxide containing a substituent metal element produced by neutralizing an acidic aqueous solution containing a trivalent iron ion and an ion of a metal that partially substitutes Fe sites is coated with silicon oxide using a silane compound.
    Type: Application
    Filed: February 4, 2020
    Publication date: March 17, 2022
    Inventors: Shin-ichi OHKOSHI, Asuka NAMAI, Marie YOSHIKIYO, Daisuke KODAMA, Shiho OBATA, Masahiro GOTOH
  • Publication number: 20210375314
    Abstract: Provided is a recording device. The recording device includes: an external magnetic field application unit that is configured to apply an external magnetic field to a magnetic recording medium; a light irradiation unit that is configured to irradiate light; and a light focusing unit that is configured to focus the light from the light irradiation unit by resonating the light to generate an enhanced magnetic field in which a magnetic field of the light is enhanced, in which magnetization of the magnetic recording medium is inverted by applying the external magnetic field and the enhanced magnetic field to the magnetic recording medium.
    Type: Application
    Filed: August 13, 2021
    Publication date: December 2, 2021
    Applicants: The University of Tokyo, OSAKA UNIVERSITY, FUJIFILM Corporation
    Inventors: Shin-ichi OHKOSHI, Marie YOSHIKIYO, Kenta IMOTO, Kosuke NAKAGAWA, Asuka NAMAI, Hiroko TOKORO, Makoto NAKAJIMA, Masashi SHIRATA, Kenji NAOI
  • Publication number: 20210367351
    Abstract: A circuit substrate includes a multi-layer substrate in which a plurality of dielectric layers are stacked, and a millimeter wave absorber provided inside the multi-layer substrate and having an electromagnetic wave absorption peak within a region of 30 to 300 GHz. An antenna element includes the circuit substrate described above, a power feeder provided inside the multi-layer substrate of the circuit substrate, and an antenna provided on a surface of the circuit substrate and connected to the power feeder. A method for reducing noise in a circuit substrate including a multi-layer substrate includes, by a millimeter wave absorber provided inside the multi-layer substrate and having an electromagnetic wave absorption peak within a region of 30 to 300 GHz, absorbing unnecessary electromagnetic waves diffused in the multi-layer substrate to reduce noise in the circuit substrate.
    Type: Application
    Filed: February 12, 2020
    Publication date: November 25, 2021
    Inventors: Shin-ichi Ohkoshi, Marie Yoshikiyo, Asuka Namai, Masayuki Asanuma, Yukihiro Shibuya, Sumire Yamazaki, Naomasa Ueda
  • Publication number: 20210300779
    Abstract: [Problem] To provide a method for producing iron based oxide magnetic powder that has a narrow particle size distribution and a small content of fine particles that do not contribute to the magnetic recording characteristics, and consequently has a narrow coercive force distribution and is suitable for the enhancement of the recording density of the magnetic recording medium. [Solution] ?-Type iron based oxide magnetic powder is obtained by a wet method, then a tetraalkylammonium salt as a surface modifier is added to a slurry containing the magnetic powder to make a concentration of 0.009 mol/kg or more and 1.0 mol/kg or less, and simultaneously to make pH of 11 or more and 14 or less, and the slurry is subjected to a dispersion treatment and then classified, so as to provide iron based oxide magnetic powder having a narrow particle size distribution and a narrow coercive force distribution.
    Type: Application
    Filed: March 26, 2019
    Publication date: September 30, 2021
    Inventors: Shin-ichi OHKOSHI, Asuka NAMAI, Kenji SAKANE, Tetsuya KAWAHITO
  • Patent number: 11087792
    Abstract: There is provided an oriented body containing platinum group-substituted-6 iron oxide particles typified by Rh-substituted ?-iron oxide or Ru-substituted ?-iron oxide applicable to MAMR, MIMR, or F-MIMR system, and a technique related thereto, containing platinum group element-substituted ?-iron oxide particles in which a part of ?-iron oxide is substituted with at least one element of platinum group elements, as magnetic particles wherein the degree of orientation of the magnetic particles defined by the degree of orientation=SQ (direction of magnetization easy-axes)/SQ (direction of magnetization hard-axes) exceeds 5.0, and a coercive force exceeds 31 kOe.
    Type: Grant
    Filed: November 30, 2016
    Date of Patent: August 10, 2021
    Assignees: THE UNIVERSITY OF TOKYO, DOWA ELECTRONICS MATERIALS CO., LTD.
    Inventors: Shin-ichi Ohkoshi, Kenta Imoto, Shizuka Anan, Asuka Namai, Kenji Masada
  • Publication number: 20210227730
    Abstract: A radio wave-absorbing laminate film in which both the top surface and the bottom surface have superior transmission attenuation properties and reflection attenuation capabilities in extremely high-frequency wave bands and higher, and which exhibits excellent radio wave absorption properties even when extremely thin; a production method for the film; and an element containing the film. A radio wave-absorbing laminate film having radio wave-absorbing layers, the radio wave-absorbing laminate film including a center layer, two substrate layers, and two radio wave-absorbing layers, the center layer containing at least one metal layer, and the two substrate layers being laminated on both surfaces of the center layer.
    Type: Application
    Filed: May 30, 2019
    Publication date: July 22, 2021
    Inventors: Shin-ichi OHKOSHI, Asuka NAMAI, Marie YOSHIKIYO, Takahiro ASAI, Masaru KUWAHARA
  • Publication number: 20210151895
    Abstract: A radio wave absorber includes a base member, and a radio wave absorption film formed on the base member. The radio wave absorption film includes at least MTC-substituted ?-Fe2O3 and black titanium oxide. The MTC-substituted ?-Fe2O3 is a crystal belonging to the same space group as an ?-Fe2O3 crystal and expressed by ?-MxTiyCoyFe2?2y?xO3 where M is at least one element selected from the group consisting of Ga, In, Al, and Rh, 0<x<1, and 0<y<1.
    Type: Application
    Filed: June 25, 2018
    Publication date: May 20, 2021
    Applicants: THE UNIVERSITY OF TOKYO, PANASONIC CORPORATION
    Inventors: Shin-ichi OHKOSHI, Asuka NAMAI, Seiji NISHITANI, Tomohiro KUZUU
  • Publication number: 20210027806
    Abstract: The present invention provides a recording method and a recording device in which information can be easily recorded even in a magnetic recording medium using epsilon iron oxide particles having a high coercive force as a magnetic recording material. A recording device of the invention applies an external magnetic field H0 that inclines magnetization of epsilon iron oxide particles to a particle dispersion element containing epsilon iron oxide particles, and irradiates the particle dispersion element with light that excites the magnetization. Accordingly, the recording device is capable of inverting magnetization that is not capable of being inverted only by the external magnetic field, in accordance with a synergetic effect between the inclination of the magnetization and the light excitation of the magnetization.
    Type: Application
    Filed: September 28, 2020
    Publication date: January 28, 2021
    Applicants: THE UNIVERSITY OF TOKYO, OSAKA UNIVERSITY, FUJIFILM Corporation
    Inventors: Shin-ichi OHKOSHI, Makoto NAKAJIMA, Masashi SHIRATA, Hiroaki DOSHITA
  • Publication number: 20210012936
    Abstract: There is provided a magnetic material that has an excellent electromagnetic wave absorption performance in a wide frequency range even under low temperature and high temperature environments and that ensures the absorption performance, and provided a magnetic material as a mixture of a magnetic material having positive slope of change in coercive force dependent on temperature, and a magnetic material having negative slope of change in coercive force dependent on temperature.
    Type: Application
    Filed: February 14, 2019
    Publication date: January 14, 2021
    Applicants: The University of Tokyo, DOWA ELECTRONICS MATERIALS CO., LTD.
    Inventors: Shin-ichi OHKOSHI, Asuka NAMAI, Marie YOSHIKIYO, Masahiro GOTOH, Toshihiko UEYAMA, Takayuki YOSHIDA
  • Patent number: 10807880
    Abstract: An epsilon iron oxide has an average particle size of 10 to 18 nm, a part of the iron element being substituted with a substitutional element and has a coercive force of 14 kOe or less, wherein a coefficient of variation of the particle size is 40% or less. A method for producing the same, a magnetic coating material and a magnetic recording medium using the epsilon iron oxide, includes depositing a metal compound of a substitutional element on iron oxide hydroxide to thereby obtain iron oxide hydroxide on which the metal compound is deposited; coating the iron oxide hydroxide on which the metal compound is deposited, with silicon oxide to thereby obtain iron oxide hydroxide coated with the silicon oxide; and applying heat treatment to the silicon oxide-coated iron oxide hydroxide in an oxidizing atmosphere, wherein a part of an iron element is substituted with the substitutional element.
    Type: Grant
    Filed: June 13, 2016
    Date of Patent: October 20, 2020
    Assignees: THE UNIVERSITY OF TOKYO, DOWA ELECTRONICS MATERIALS CO., LTD.
    Inventors: Shin-ichi Ohkoshi, Syunsuke Oka, Asuka Namai, Kenji Masada
  • Patent number: 10669161
    Abstract: There are provided an oriented body such as a magnetic sheet in which a value of degree of orientation of magnetic particles is beyond 3.5, and a method for producing the same, and a device for producing the same, wherein the oriented body such as a magnetic sheet is produced through the steps of: mixing a mixed solution containing a solvent and a vehicle and ?-iron oxide particles by shaking stirring, and dispersing the ?-iron oxide particles in the mixed solution; providing a mixed solution in which the ?-iron oxide particles are dispersed, on a predetermined substrate; and removing the solvent while applying a magnetic field to the substrate provided with the mixed solution, to obtain an oriented body.
    Type: Grant
    Filed: January 18, 2016
    Date of Patent: June 2, 2020
    Assignees: THE UNIVERSITY OF TOKYO, DOWA ELECTRONICS MATERIALS CO., LTD.
    Inventors: Shin-ichi Ohkoshi, Hiroko Tokoro, Koji Nakabayashi, Asuka Namai, Kenta Imoto, Kenji Masada
  • Patent number: 10544996
    Abstract: The waste heat recovery and dissipation apparatus incorporates a heat storage/dissipation material containing a new titanium oxide. When a pressure received by the heat storage/dissipation material from a coolant flowing through a flow channel is increased to a predetermined pressure PHR (about 60 MPa) or higher in a state where the crystal structure of the new titanium oxide is a ?-phase, the heat stored in the heat storage/dissipation material is released to the coolant. When a temperature of the heat storage/dissipation material is increased to a predetermined temperature THS (about 460 K) or higher by the heat of exhaust gas flowing a gas flow channel in a state where the crystal structure of the new titanium oxide is ?-phase, the heat of the exhaust gas is stored in the heat storage/dissipation material.
    Type: Grant
    Filed: June 5, 2017
    Date of Patent: January 28, 2020
    Assignees: TOYOTA JIDOSHA KABUSHIKI KAISHA, THE UNIVERSITY OF TOKYO
    Inventors: Akihiro Honda, Shin-ichi Ohkoshi