Patents by Inventor Junya NITTA

Junya NITTA 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: 12092242
    Abstract: A pipe welding structure includes: a channel plate that includes a fluid channel; through-hole plates stacked on the channel plate, each of the through-hole plates having through holes that communicate with each other and forming a combined through hole; and a pipe inserted into the combined through hole and welded to one of the through-hole plates disposed farthest from the channel plate, the pipe internally including a pipe channel that connects to the fluid channel.
    Type: Grant
    Filed: March 4, 2022
    Date of Patent: September 17, 2024
    Assignee: CKD CORPORATION
    Inventors: Shinichi Nitta, Junya Hashizume, Mitsuyoshi Ohsaki
  • 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: 20230193103
    Abstract: The alumina powder contains: a first alumina particle having an average particle diameter of 0.1 µm or more and less than 1 µm; a second alumina particle having an average particle diameter of 1 µm or more and less than 10 µm; and a third alumina particle having an average particle diameter of 10 µm or more and 100 µm or less, wherein each of the average particle diameters is a particle diameter measured using laser light diffraction scattering particle size distribution analyzer, average sphericity of first alumina particle having projected area equivalent circle diameter of 0.1 µm or more and 1 µm or less as determined by microscopy is 0.80 or more and 0.98 or less, a specific surface area of first alumina particle is 1.9 m2/g or more and 20.0 m2/g or less, and content ratio of an ? crystal phase is 80% by mass or more.
    Type: Application
    Filed: March 24, 2021
    Publication date: June 22, 2023
    Applicant: DENKA COMPANY LIMITED
    Inventors: Takafumi KOMAKI, Junya NITTA, Yoshiaki OKAMOTO, Masakazu HIRATA, Genta KARINO
  • Publication number: 20230159725
    Abstract: An alumina powder containing alumina particles, wherein among the alumina particles, an average sphericity of an alumina particle having a projected area equivalent circle diameter of 50 nm or more as determined by microscopy is 0.80 or more, a content ratio of an alumina particle having a particle diameter of 75 ?m or more is 0.05% by mass or less, an average particle diameter of the alumina powder is 0.2 ?m or more and 15 ?m or less, the average particle diameter is a particle diameter measured using a laser light diffraction scattering particle size distribution analyzer, and an amount of water included in the alumina powder measured by a specific measurement method is 30 ppm or more and 500 ppm or less.
    Type: Application
    Filed: March 24, 2021
    Publication date: May 25, 2023
    Applicant: DENKA COMPANY LIMITED
    Inventors: Junya NITTA, Jun YAMAGUCHI, Tomohiro KAWABATA, Hideaki HIRAI, Yasuhisa NISHI
  • Publication number: 20230150830
    Abstract: A carbon-containing alumina powder containing a carbon-containing alumina particle having a projected area equivalent circle diameter of 1 ?m or more and 100 ?m or less as determined by microscopy, wherein an average sphericity of the carbon-containing alumina particle is 0.85 or more, and a specific surface area is 0.05 m2/g or more and 1.0 m2/g or less, and a ratio B/A of a carbon content ratio B to a carbon content ratio A in the carbon-containing alumina powder calculated by using a specific measurement method is 0.20 or more and 0.90 or less.
    Type: Application
    Filed: March 24, 2021
    Publication date: May 18, 2023
    Applicant: DENKA COMPANY LIMITED
    Inventors: Takafumi KOMAKI, Junya NITTA, Yoshiaki OKAMOTO, Masakazu HIRATA, Genta KARINO
  • Publication number: 20230134132
    Abstract: An alumina powder containing: a first alumina particle having average particle diameter from 0.1 ?m to 1 ?m; a second alumina particle having average particle diameter from 1 ?m to 10 ?m; and a third alumina particle having average particle diameter from 10 ?m to 100 ?m, wherein the particle diameters are measured using laser light diffraction scattering particle size distribution analyzer, average sphericity of first alumina particle having projected area equivalent circle diameter from 0.1 ?m to 1 ?m as determined by microscopy is from 0.80 to 0.98, and a ratio of D90/D10 of first alumina particle is from 2.0 to 8.0 wherein the ratio of D90/D10 is a ratio when particle diameter at cumulative value of 10% from fine particle side of cumulative particle size distribution on volume basis is D10 and particle diameter at cumulative value of 90% from fine particle side is D90.
    Type: Application
    Filed: March 24, 2021
    Publication date: May 4, 2023
    Applicant: DENKA COMPANY LIMITED
    Inventors: Takafumi KOMAKI, Junya NITTA, Yoshiaki OKAMOTO, Masakazu HIRATA, Genta KARINO
  • 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