Patents by Inventor Tetsuya Igarashi

Tetsuya Igarashi 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: 11072537
    Abstract: Ferrite powder of the present invention is ferrite powder detectable with a metal detector, comprising: soft ferrite particles containing Mn of 3.5 mass % or more and 20.0 mass % or less and Fe of 50.0 mass % or more and 70.0 mass % or less. It is preferable that a volume average particle diameter of the particles constituting the ferrite powder is 0.1 ?m or more and 100 ?m or less. It is preferable that magnetization by a VSM measurement when magnetic field of 5 K·1000/4?A/m is applied is 85 A·m2/kg or more and 98 A·m2/kg or less.
    Type: Grant
    Filed: April 11, 2017
    Date of Patent: July 27, 2021
    Assignee: Powdertech Co., Ltd.
    Inventors: Koji Aga, Tetsuya Igarashi
  • Patent number: 11032955
    Abstract: The present invention provides a powdered ferrite having high dispersibility in a resin and high electromagnetic shielding characteristics. The powdered ferrite comprises platy ferrite particles having a spinel crystal structure. The powdered ferrite comprises at least 50 number % platy ferrite particles each having at least one protrusion on a surface of the particle, and the protrusion has a shape selected from the group consisting of a rectangular pyramid, a truncated rectangular pyramid, an elongated rectangular pyramid, and combinations thereof.
    Type: Grant
    Filed: April 5, 2017
    Date of Patent: June 8, 2021
    Assignee: POWDERTECH CO., LTD.
    Inventors: Koji Aga, Tetsuya Igarashi
  • Patent number: 11014826
    Abstract: An object of the present invention is to provide ferrite particles having a high saturation magnetisation, and being excellent in the dispersibility in a resin, a solvent or a resin composition, a resin composition including the ferrite particles, and a resin film composed of the resin composition. The ferrite particles are a single crystalline body having an average particle size of 1 to 2000 nm, and Mn-based ferrite particles having a spherical shape, and have a saturation magnetisation of 45 to 95 Am2/kg. The resin composition includes the ferrite particles as a filler. The resin film is composed of the resin composition.
    Type: Grant
    Filed: February 22, 2017
    Date of Patent: May 25, 2021
    Assignee: POWDERTECH CO., LTD.
    Inventors: Takashi Kojima, Kazutaka Ishii, Takao Sugiura, Tetsuya Igarashi, Koji Aga
  • Publication number: 20210047200
    Abstract: Provided are: an Mn ferrite powder characterized by including a plurality of ferrite particles, having a volume-average particle diameter of 1-10 ?m, and having a 2.106 ?m volume-based cumulative distribution (sieved) of 0.1-50.0 vol %; and a resin composition characterized by including said powder and a resin material.
    Type: Application
    Filed: February 6, 2019
    Publication date: February 18, 2021
    Applicant: POWDERTECH CO., LTD.
    Inventors: Koji AGA, Takashi KOJIMA, Kazutaka ISHII, Tetsuya IGARASHI, Sho KUWAHARA
  • Patent number: 10825593
    Abstract: An object of the present invention is to provide ferrite particles having high saturation magnetisation and electrical resistivity, excellent in dispersibility in a resin, a solvent, or a resin composition; a rein composition containing the ferrite particles; and a resin molding composed of the resin composition. A Ni-Zn-Cu ferrite particle is in a single crystalline body having an average particle diameter of 1 to 2000 nm, has a polyhedral particle shape, and comprises 5 to 10 wt % of Ni, 15 to 30 wt % of Zn, 1 to 5 wt % of Cu, and 25 to 50 wt % of Fe.
    Type: Grant
    Filed: June 7, 2017
    Date of Patent: November 3, 2020
    Assignee: POWDERTECH CO., LTD.
    Inventors: Takashi Kojima, Kazutaka Ishii, Takao Sugiura, Tetsuya Igarashi, Koji Aga
  • Publication number: 20200251263
    Abstract: Mn—Zn ferrite particles according to the present invention contain 44-60% by mass of Fe, 10-16% by mass of Mn and 1-11% by mass of Zn. The ferrite particles are single crystal bodies having an average particle diameter of 1-2,000 nm, and have polyhedral particle shapes, while having an average sphericity of 0.85 or more but less than 0.95.
    Type: Application
    Filed: September 27, 2018
    Publication date: August 6, 2020
    Inventors: Takashi KOJIMA, Kazutaka ISHII, Takao SUGIURA, Tetsuya IGARASHI, Koji AGA
  • Patent number: 10593454
    Abstract: An object is to provide the ferrite particles used as a magnetic filler or a raw material for a molded product excellent in dispersibility as a powder and excellent in uniformity after molding and result the surface with small unevenness; and a method of manufacturing the particles. To achieve the object, Mn—Mg ferrite particles having an average particle size of 1 to 2000 nm and having a spherical shape are employed. It is preferable that the ferrite particles are produced by a method including subjecting of a ferrite raw material obtained through preparation of a ferrite composition to flame-spraying in air for ferritization followed by rapid cooling for solidifying of the ferrite.
    Type: Grant
    Filed: September 2, 2015
    Date of Patent: March 17, 2020
    Assignee: POWDERTECH CO., LTD.
    Inventors: Koji Aga, Tetsuya Igarashi
  • Patent number: 10562111
    Abstract: A cutting tool 1 includes a cutting edge equipped with a helically curved groove 2 at a side outer periphery in the longitudinal direction, and a coolant passage pipe 3 extended internally and communicatively connected with ejection holes 4 of coolant arranged inside the groove 2 by way of a coolant passage pipe 31 branched from the coolant passage pipe 3 extended around a rotation center axis along the longitudinal direction or along the helically curved groove.
    Type: Grant
    Filed: December 28, 2018
    Date of Patent: February 18, 2020
    Assignee: Matsuura Machinery Corporation
    Inventors: Kouichi Amaya, Ryuzo Tanaka, Yoshiaki Kano, Yasunori Takezawa, Tetsuya Igarashi
  • Patent number: 10501333
    Abstract: The present invention provides a spherical ferrite powder that is excellent in filling ability and moldability if used as a filler, is excellent in handling ability, and is high in resistivity; a resin compound including the ferrite powder; and a molded product made of the resin compound. The spherical ferrite powder including 15 to 30 wt % of ferrite particles having the particle diameter less than 11 ?m and have the volume average particle diameter of 10 to 50 ?m; the resin compound including the ferrite powder; and the molded product made of the resin compound are employed.
    Type: Grant
    Filed: August 31, 2015
    Date of Patent: December 10, 2019
    Assignees: POWDERTECH CO., LTD., TATSUTA ELECTRIC WIRE & CABLE CO., LTD.
    Inventors: Koji Aga, Tetsuya Igarashi, Akio Takahashi
  • Publication number: 20190341177
    Abstract: An object of the present invention is to provide ferrite particles having high saturation magnetisation and electrical resistivity, excellent in dispersibility in a resin, a solvent, or a resin composition; a rein composition containing the ferrite particles; and a resin molding composed of the resin composition. A Ni-Zn-Cu ferrite particle is in a single crystalline body having an average particle diameter of 1 to 2000 nm, has a polyhedral particle shape, and comprises 5 to 10 wt % of Ni, 15 to 30 wt % of Zn, 1 to 5 wt % of Cu, and 25 to 50 wt % of Fe.
    Type: Application
    Filed: June 7, 2017
    Publication date: November 7, 2019
    Applicant: POWDERTECH CO., LTD.
    Inventors: Takashi KOJIMA, Kazutaka ISHII, Takao SUGIURA, Tetsuya IGARASHI, Koji AGA
  • Publication number: 20190343027
    Abstract: The present invention provides a powdered ferrite having high dispersibility in a resin and high electromagnetic shielding characteristics. The powdered ferrite comprises platy ferrite particles having a spinel crystal structure. The powdered ferrite comprises at least 50 number % platy ferrite particles each having at least one protrusion on a surface of the particle, and the protrusion has a shape selected from the group consisting of a rectangular pyramid, a truncated rectangular pyramid, an elongated rectangular pyramid, and combinations thereof.
    Type: Application
    Filed: April 5, 2017
    Publication date: November 7, 2019
    Applicant: POWDERTECH CO., LTD
    Inventors: Koji AGA, Tetsuya IGARASHI
  • Publication number: 20190300379
    Abstract: An object of the present invention is to provide ferrite particles having a high magnetic permeability in a frequency band of 1 MHz to 1 GHz. Another object is to provide a resin composition containing the ferrite particles and an electromagnetic wave shielding material composed of the resin composition. The ferrite particles are composed of a single crystalline body having an average particle size of 1 to 2000 nm and has a spherical particle shape, wherein the ferrite particles contain substantially no Zn, 3 to 25 wt % of Mn, and 43 to 65 wt % of Fe, and a real part ?? of a complex magnetic permeability measured using a molding composed of the ferrite particles and a binder resin has a maximal value in a frequency band of 100 MHz to 1 GHz.
    Type: Application
    Filed: May 31, 2017
    Publication date: October 3, 2019
    Applicant: POWDERTECH CO., LTD.
    Inventors: Takashi KOJIMA, Kazutaka ISHII, Takao SUGIURA, Tetsuya IGARASHI, Koji AGA
  • Publication number: 20190224760
    Abstract: A cutting tool 1 has cutting edges 2 formed by a plurality of side surfaces on both sides 21, 22 raised at a side portion along a longitudinal direction, and the cutting tool 1 in which a coolant passage pipe 30 is extended around a rotation center axis 5, and coolant passage pipes 31 branched from the extended coolant passage pipe 30 are projected along a direction of a raised side surface 21 on a rotating direction side of the raised side surfaces on both sides 21, 22.
    Type: Application
    Filed: December 28, 2018
    Publication date: July 25, 2019
    Inventors: Kouichi Amaya, Ryuzo Tanaka, Yoshiaki Kano, Yasunori Takezawa, Tetsuya Igarashi
  • Publication number: 20190224761
    Abstract: A cutting tool 1 includes a cutting edge equipped with a helically curved groove 2 at a side outer periphery in the longitudinal direction, and a coolant passage pipe 3 extended internally and communicatively connected with ejection holes 4 of coolant arranged inside the groove 2 by way of a coolant passage pipe 31 branched from the coolant passage pipe 3 extended around a rotation center axis along the longitudinal direction or along the helically curved groove.
    Type: Application
    Filed: December 28, 2018
    Publication date: July 25, 2019
    Inventors: Kouichi Amaya, Ryuzo Tanaka, Yoshiaki Kano, Yasunori Takezawa, Tetsuya Igarashi
  • Publication number: 20190161362
    Abstract: An object of the present invention is to provide ferrite particles having a high saturation magnetisation, and being excellent in the dispersibility in a resin, a solvent or a resin composition, a resin composition including the ferrite particles, and a resin film composed of the resin composition. The ferrite particles are a single crystalline body having an average particle size of 1 to 2000 nm, and Mn-based ferrite particles having a spherical shape, and have a saturation magnetisation of 45 to 95 Am2/kg. The resin composition includes the ferrite particles as a filler. The resin film is composed of the resin composition.
    Type: Application
    Filed: February 22, 2017
    Publication date: May 30, 2019
    Applicant: POWDERTECH CO., LTD.
    Inventors: Takashi KOJIMA, Kazutaka ISHII, Takao SUGIURA, Tetsuya IGARASHI, Koji AGA
  • Publication number: 20190135653
    Abstract: Ferrite powder of the present invention is ferrite powder detectable with a metal detector, comprising: soft ferrite particles containing Mn of 3.5 mass % or more and 20.0 mass % or less and Fe of 50.0 mass % or more and 70.0 mass % or less. It is preferable that a volume average particle diameter of the particles constituting the ferrite powder is 0.1 ?m or more and 100 ?m or less. It is preferable that magnetization by a VSM measurement when magnetic field of 5 K·1000/4?A/m is applied is 85 A·m2/kg or more and 98 A·m2/kg or less.
    Type: Application
    Filed: April 11, 2017
    Publication date: May 9, 2019
    Applicant: Powdertech Co., Ltd.
    Inventors: Koji AGA, Tetsuya IGARASHI
  • Publication number: 20190040226
    Abstract: Ferrite powder of the present invention is ferrite powder detectable with a metal detector, comprising: hard ferrite particles containing Sr of 7.8 mass % or more and 9.0 mass % or less and Fe of 61.0 mass % or more and 65.0 mass % or less, wherein an amount of Na to be measured by ion chromatography is 1 ppm or more and 200 ppm or less. It is preferable that a volume average particle diameter of the particles constituting the ferrite powder is 0.1 ?m or more and 100 ?m or less. It is preferable that residual magnetization by a VSM measurement when magnetic field of 10 K·1000/4?A/m is applied is 25 A·m2/kg or more and 40 A·m2/kg or less.
    Type: Application
    Filed: March 27, 2017
    Publication date: February 7, 2019
    Applicant: Powdertech Co., Ltd.
    Inventors: Koji AGA, Tetsuya IGARASHI
  • Publication number: 20180179082
    Abstract: The present invention provides a spherical ferrite powder that is excellent in filling ability and moldability if used as a filler, is excellent in handling ability, and is high in resistivity; a resin compound including the ferrite powder; and a molded product made of the resin compound. The spherical ferrite powder including 15 to 30 wt % of ferrite particles having the particle diameter less than 11 ?m and have the volume average particle diameter of 10 to 50 ?m; the resin compound including the ferrite powder; and the molded product made of the resin compound are employed.
    Type: Application
    Filed: August 31, 2015
    Publication date: June 28, 2018
    Applicants: POWDERTECH CO., LTD., TATSUTA ELECTRIC WIRE & CABLE CO., LTD.
    Inventors: Koji AGA, Tetsuya IGARASHI, Akio TAKAHASHI
  • Publication number: 20180009677
    Abstract: Objects are to provide a ferrite powder having a residual magnetization and a coercive force larger than those of spherical hard ferrite particle, and magnetic permeability ?? is maximum in a specific frequency range, a manufacturing method thereof, a resin compound containing the ferrite powder, and a molded product made from the resin compound. To achieve the objects, a hexagonal plate shaped ferrite powder containing 7.8 to 9 wt % of Sr, 61 to 65 wt % of Fe, and 0.1 to 0.65 wt % of Mg, a manufacturing method thereof, a resin compound containing the hexagonal plate shaped ferrite powder, and a molded product made from the resin compound are employed.
    Type: Application
    Filed: January 21, 2016
    Publication date: January 11, 2018
    Applicant: POWDERTECH CO., LTD.
    Inventors: Koji AGA, Tetsuya IGARASHI
  • Publication number: 20170349449
    Abstract: An object is to provide a plate shaped ferrite particle for a pigment, having both of electromagnetic wave shielding ability and designability, a resin molded material containing the plate shaped ferrite particle a pigment, and an electromagnetic wave shield housing for storing an electronic circuit manufactured by using the resin molded material. To achieve the object, the plate shaped ferrite particles for a pigment having a metallic luster, a resin molded material containing the plate shaped ferrite particles for a pigment, an electromagnetic wave shield housing for storing an electronic circuit manufactured by using the resin molded material are employed.
    Type: Application
    Filed: January 21, 2016
    Publication date: December 7, 2017
    Applicant: POWDERTECH CO., LTD.
    Inventors: Koji AGA, Tetsuya IGARASHI