Patents by Inventor Koji Aga

Koji Aga 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: 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
  • Publication number: 20210168974
    Abstract: The present invention provides: composite particles each comprising a base particle composed of ferrite, and a coating layer composed of a material containing at least one element selected from the group consisting of Au, Ag, Pt, Ni and Pd; a powder characterised by containing a plurality of the composite particles; a resin composition characterised by containing the powder and a resin material; and a moulded body characterised by being produced using a material containing the powder and the resin material.
    Type: Application
    Filed: August 2, 2018
    Publication date: June 3, 2021
    Inventor: Koji AGA
  • 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: 10919779
    Abstract: Provided is an iron oxide powder for a brake friction material which can be suitably used in a brake friction material that is less likely to cause problems regarding brake squealing and that provides superior braking performance. The iron oxide powder for a brake friction material according to the present invention is characterized by having an average particle size of 40 ?m or more and a saturation magnetization of 20 emu/g or less. The iron oxide powder preferably has a pore volume of 10-180 mm3/g. The iron oxide powder also preferably has a BET specific surface area of 0.05-1.20 m2/g.
    Type: Grant
    Filed: December 12, 2017
    Date of Patent: February 16, 2021
    Assignee: POWDERTECH CO., LTD.
    Inventors: Koji Aga, Takashi Kojima
  • 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
  • Patent number: 10775711
    Abstract: An object of the present invention is to provide a ferrite carrier core material for an electrophotographic developer having desired resistance properties and charging properties with small environmental variation of resistivity and charge amount while maintaining the advantages of ferrite carriers, a ferrite carrier for an electrophotographic developer, an electrophotographic developer using the ferrite carrier, and a method for manufacturing the ferrite carrier core material for an electrophotographic developer. In order to solve the problem, a ferrite carrier core material comprising ferrite particles containing 15 mass % or more and 25 mass % or less of Mn, 0.5 mass % or more and 5.0 mass % or less of Mg, 0.05 mass % or more and 4.0 mass % of Sr, and 45 mass % or more and 55 mass % or less of Fe, with Si localized in the surface thereof is used.
    Type: Grant
    Filed: March 29, 2017
    Date of Patent: September 15, 2020
    Assignee: POWDERTECH CO., LTD.
    Inventors: Takao Sugiura, Kazutaka Ishii, 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
  • Publication number: 20200143966
    Abstract: The ferrite powder of the present invention is a ferrite powder containing a plurality of ferrite particles, wherein the ferrite particles each are a single crystal body having an average particle diameter of 1-2,000 nm, and have a polyhedron shape, and wherein the ferrite particles each contain 2.0-10.0 mass % of Sr, and 55.0-70.0 mass % of Fe.
    Type: Application
    Filed: March 30, 2018
    Publication date: May 7, 2020
    Inventors: Kazutaka ISHII, Koji AGA, Takao SUGIURA, Takashi KOJIMA
  • Patent number: 10603614
    Abstract: An object of the present invention is to provide ferrite particles for a filtering medium excellent in filtration ability having a small apparent density, capable of various properties maintained in the controllable state and filling a specified volume with a small amount, and a filtering medium made from the ferrite particles. In order to achieve the object, ferrite particles provided an outer shell structure containing Ti oxide for a filtering medium, and a filtering medium made from the ferrite particles are employed.
    Type: Grant
    Filed: January 25, 2016
    Date of Patent: March 31, 2020
    Assignee: POWDERTECH CO., LTD.
    Inventors: Koji Aga, Takao Sugiura
  • 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: 10585369
    Abstract: An object of the present invention is to provide a ferrite particle having a low apparent density, filling a specified volume with a low weight with various properties maintained in a controllable state, a ferrite carrier core material composed of the ferrite particle, and a ferrite carrier using the ferrite core material and an electrophotographic developer. To achieve the object, the ferrite particle having the outer shell structure containing the Ti oxide for the ferrite carrier core material, and the ferrite carrier using the ferrite particle as the ferrite carrier core material and the electrophotographic developer are employed.
    Type: Grant
    Filed: January 25, 2016
    Date of Patent: March 10, 2020
    Assignee: POWDERTECH CO., LTD.
    Inventors: Koji Aga, Takao Sugiura
  • Patent number: 10564561
    Abstract: An object of the present invention is to provide a ferrite carrier core material for an electrophotographic developer having desired resistance properties and charging properties with small environmental variation of resistivity and charge amount while maintaining the advantages of ferrite carriers, a ferrite carrier for an electrophotographic developer, an electrophotographic developer using the ferrite carrier, and a method for manufacturing the ferrite carrier core material for an electrophotographic developer. In order to solve the problem, a ferrite carrier core material comprising ferrite particles containing 15 mass % or more and 25 mass % or less of Mn, 0.5 mass % or more and 5.0 mass % or less of Mg, 0.05 mass % or more and 4.0 mass % of Sr, and 45 mass % or more and 55 mass % or less of Fe, with Zr localized in the surface thereof is used.
    Type: Grant
    Filed: March 29, 2017
    Date of Patent: February 18, 2020
    Assignee: POWDERTECH CO., LTD.
    Inventors: Takao Sugiura, Kazutaka Ishii, Koji Aga
  • Publication number: 20200003268
    Abstract: Provided is an iron oxide powder for a brake friction material which can be suitably used in a brake friction material that is less likely to cause problems regarding brake squealing and that provides superior braking performance. The iron oxide powder for a brake friction material according to a first embodiment of the present invention is characterized by having a sulfur content of 150 ppm or less as measured by combustion ion chromatography, and a saturation magnetization of 20 emu/g or less. The iron oxide powder for a brake friction material according to a second embodiment of the present invention is characterized by having an average particle size of 1.0 ?m or more, a chlorine content of 150 ppm or less as measured by combustion ion chromatography, and a saturation magnetization of 20 emu/g or less.
    Type: Application
    Filed: December 12, 2017
    Publication date: January 2, 2020
    Applicant: POWDERTECH CO., LTD.
    Inventors: Koji AGA, Takashi KOJIMA
  • 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: 20190337818
    Abstract: Provided is an iron oxide powder for a brake friction material which can be suitably used in a brake friction material that is less likely to cause problems regarding brake squealing and that provides superior braking performance. The iron oxide powder for a brake friction material according to the present invention is characterized by having an average particle size of 40 ?m or more and a saturation magnetization of 20 emu/g or less. The iron oxide powder preferably has a pore volume of 10-180 mm3/g. The iron oxide powder also preferably has a BET specific surface area of 0.05-1.20 m2/g.
    Type: Application
    Filed: December 12, 2017
    Publication date: November 7, 2019
    Applicant: POWDERTECH CO., LTD.
    Inventors: Koji AGA, Takashi KOJIMA
  • 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: 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