Patents by Inventor Takahisa Mizumoto

Takahisa Mizumoto 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: 20240174529
    Abstract: A method for producing a barium titanate-based powder, the method including: step a of spraying a raw material including a barium titanate-based compound into a high-temperature field heated to a temperature equal to or higher than a melting point of the compound to form barium titanate-based particles; and step b of heating a powder including the barium titanate-based particles formed in step a at 700 to 1300° C.
    Type: Application
    Filed: February 28, 2022
    Publication date: May 30, 2024
    Applicant: DENKA COMPANY LIMITED
    Inventors: Kazuki HIROTA, Junya NITTA, Yasutaka OSHIMA, Takahisa MIZUMOTO, Hiroaki YOSHIGAI
  • Publication number: 20240166529
    Abstract: A method for producing a barium titanate-based powder, the method including: step a of spraying a raw material including a barium titanate-based compound into a high-temperature field heated to a temperature equal to or higher than a melting point of the compound to form barium titanate-based particles; step b of calcining a powder including the barium titanate-based particles formed in step a; and step c of washing a calcination product obtained in step b with a water-based washing liquid.
    Type: Application
    Filed: February 28, 2022
    Publication date: May 23, 2024
    Applicant: DENKA COMPANY LIMITED
    Inventors: Kazuki HIROTA, Yasutaka OSHIMA, Yuzo NAKAMURA, Takahisa MIZUMOTO, Hiroaki YOSHIGAI
  • Patent number: 10259944
    Abstract: Provided is an external additive for toner, which is suitable for producing a toner having excellent storage stability and chargeability. A silica fine powder suitable for being added to the external additive for toner is also provided. The silica fine powder has a specific surface area of 15 m2/g or more and 90 m2/g or less, a loose bulk density of 0.09 g/cm3 or more and 0.18 g/cm3 or less, a carbon content of 0.25 wt % or more and 0.90 wt % or less, and a hydrophobicity of 60% or more and 75% or less. It is preferable that a ratio (A)/(B) of the loose bulk density of the silica fine powder after surface treatment (A) to a loose bulk density of the silica fine powder before the surface treatment (B) be 1.05 or more and 1.60 or less.
    Type: Grant
    Filed: July 24, 2015
    Date of Patent: April 16, 2019
    Assignee: DENKA COMPANY LIMITED
    Inventors: Shuji Sasaki, Junya Nitta, Takahisa Mizumoto
  • Publication number: 20170198147
    Abstract: Provided is an external additive for toner, which is suitable for producing a toner having excellent storage stability and chargeability. A silica fine powder suitable for being added to the external additive for toner is also provided. The silica fine powder has a specific surface area of 15 m2/g or more and 90 m2/g or less, a loose bulk density of 0.09 g/cm3 or more and 0.18 g/cm3 or less, a carbon content of 0.25 wt % or more and 0.90 wt % or less, and a hydrophobicity of 60% or more and 75% or less. It is preferable that a ratio (A)/(B) of the loose bulk density of the silica fine powder after surface treatment (A) to a loose bulk density of the silica fine powder before the surface treatment (B) be 1.05 or more and 1.60 or less.
    Type: Application
    Filed: July 24, 2015
    Publication date: July 13, 2017
    Inventors: Shuji SASAKI, Junya NITTA, Takahisa MIZUMOTO
  • Publication number: 20140141370
    Abstract: Provided is a suitable toner external additive which has an excellent spacer effect, without causing image defects in repeated image formation and which is suitable in preparing a toner with stable printing properties and to provide a fine spherical silica powder suitable for adding to the toner additive. A fine spherical silica power having an average particle size measured by a laser diffraction/scattering distribution measuring apparatus of 0.090 ?m or more and 0.140 ?m or less, a particle content ratio of 5.0% by mass or more and 25.0% by mass or less when the particle diameter is 0.150 ?m or more, and a particle content ratio of 1.0% by mass or less when the particle diameter is 0.300 ?m or more.
    Type: Application
    Filed: January 28, 2014
    Publication date: May 22, 2014
    Applicant: DENKI KAGAKU KOGYO KABUSHIKI KAISHA
    Inventors: Shuji SASAKI, Masaaki HIDESHIMA, Hideaki SONODA, Takahisa MIZUMOTO
  • Publication number: 20110046267
    Abstract: To provide an alumina powder having an improved flowability, a process for its production, and a resin composition employing it. An alumina powder which has an ?-phase content of at most 40% as measured by the following method, an average circularity of at least 0.
    Type: Application
    Filed: April 28, 2009
    Publication date: February 24, 2011
    Applicant: Denki Kagaku Kogyo Kabushiki Kaisha
    Inventors: Takaaki Tanaka, Osamu Kunitomo, Takahisa Mizumoto, Hisashi Esaki, Akinori Shimokawa