Patents by Inventor Seiji KOBASHI

Seiji KOBASHI 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: 20230146575
    Abstract: Provided is a boron nitride sintered body having a porous structure, the boron nitride sintered body including a lump particle formed by aggregation of primary particles of boron nitride and having a particle diameter of 15 ?m or more. Provided is a method for manufacturing a boron nitride sintered body, the method including: a nitriding step of firing a raw material powder containing boron carbide in an atmosphere containing nitrogen to obtain a fired product including lump particles each having a core part with primary particles of boron carbonitride aggregated and a shell part surrounding the core part; and a firing step of molding and heating a blend containing the fired product including lump particles and a sintering aid to obtain the boron nitride sintered body having a porous structure and including lump particles of boron nitride.
    Type: Application
    Filed: March 26, 2021
    Publication date: May 11, 2023
    Applicant: Denka Company Limited
    Inventors: Koki IKARASHI, Nobuya SUZUKI, Koji NISHIMURA, Makoto TAKEDA, Seiji KOBASHI
  • Publication number: 20230142330
    Abstract: Provided is a boron nitride sintered body including: a plurality of coarse particles each having a length of 20 ?m or more; and fine particles smaller than the plurality of coarse particles, in which, when viewed in a cross-section, the plurality of coarse particles intersect with each other. Provided is a method for manufacturing a boron nitride sintered body, the method including: a raw material preparation step of firing a mixture containing boron carbonitride and a boron compound in a nitrogen atmosphere to obtain lump boron nitride having an average particle diameter of 10 to 200 ?m; and a sintering step of molding and heating a blend containing the lump boron nitride and a sintering aid to obtain a boron nitride sintered body including coarse particles each having a length of 20 ?m or more in a cross-section and fine particles smaller than the coarse particles.
    Type: Application
    Filed: March 26, 2021
    Publication date: May 11, 2023
    Applicant: Denka Company Limited
    Inventors: Koki IKARASHI, Makoto TAKEDA, Seiji KOBASHI, Koji NISHIMURA
  • Publication number: 20230085806
    Abstract: Provided is a boron nitride sintered body including boron nitride particles and pores, the boron nitride sintered body having a sheet shape and a thickness of less than 2 mm. Provided is a method for manufacturing a boron nitride sintered body, the method including a sintering step of molding and heating a blend containing a boron carbonitride powder and a sintering aid to obtain a sheet-shaped boron nitride sintered body including boron nitride particles and pores, in which a thickness of the boron nitride sintered body obtained in the sintering step is less than 2 mm.
    Type: Application
    Filed: March 26, 2021
    Publication date: March 23, 2023
    Applicant: Denka Company Limited
    Inventors: Koki IKARASHI, Makoto TAKEDA, Seiji KOBASHI, Koji NISHIMURA
  • Publication number: 20220177377
    Abstract: A silicon nitride substrate includes silicon nitride and magnesium, in which when a surface of the silicon nitride substrate is analyzed with an X-ray fluorescence spectrometer under the specific Condition I, XB/XA is 0.8 or more and 1.0 or less.
    Type: Application
    Filed: March 27, 2020
    Publication date: June 9, 2022
    Applicant: DENKA COMPANY LIMITED
    Inventors: Yuta TSUGAWA, Seiji KOBASHI, Koji NISHIMURA
  • Publication number: 20220161366
    Abstract: A scribe line is formed on a first surface of a nitride ceramic base material by a laser. Next, the nitride ceramic base material is divided along the scribe line. The scribe line includes a plurality of recessed portions. The plurality of recessed portions are formed in a row on the first surface of the nitride ceramic base material. A depth of each of the plurality of recessed portions is equal to or greater than 0.70 times and equal to or smaller than 1.10 times an opening width of each of the plurality of recessed portions. The opening width of each of the plurality of recessed portions is equal to or greater than 1.00 times and equal to or smaller than 1.10 times an inter-center distance of the plurality of recessed portions.
    Type: Application
    Filed: March 12, 2020
    Publication date: May 26, 2022
    Applicant: DENKA COMPANY LIMITED
    Inventors: Akimasa YUASA, Yoshiyuki ESHIMA, Daiki FUJIYOSHI, Seiji KOBASHI, Koji NISHIMURA
  • Publication number: 20220147723
    Abstract: A ceramic green sheet including a plurality of substrate forming regions. A barcode or a two-dimensional code is drawn in a portion of the ceramic green sheet. The barcode or the two-dimensional code is obtained by encoding one or more of the following information. Information relating to raw materials used when the ceramic green sheet is produced, information relating to molding conditions of the ceramic green sheet, information relating to a release agent used when a plurality of the ceramic green sheets are stacked, or a serial number.
    Type: Application
    Filed: February 28, 2020
    Publication date: May 12, 2022
    Applicant: DENKA COMPANY LIMITED
    Inventors: Akimasa YUASA, Seiji KOBASHI, Koji NISHIMURA
  • Publication number: 20220098121
    Abstract: A method for manufacturing a single sheet-type green sheet includes a transporting step of transporting a strip-shaped green sheet that contains ceramic along a longitudinal direction thereof, and an irradiation step of irradiating the transported strip-shaped green sheet with a laser beam to cut the strip-shaped green sheet, thereby obtaining a single sheet-type green sheet.
    Type: Application
    Filed: January 30, 2020
    Publication date: March 31, 2022
    Applicant: DENKA COMPANY LIMITED
    Inventors: Akimasa YUASA, Yoshiyuki ESHIMA, Ryuhei WATANABE, Seiji KOBASHI, Koji NISHIMURA