Patents by Inventor Kouki Ichitsubo

Kouki Ichitsubo 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: 9816200
    Abstract: A silicon carbide powder which, when used as a raw material in a sublimation recrystallization method, enables improvement in productivity of a silicon carbide single crystal by exhibiting a high sublimation rate and allowing a small amount of silicon carbide to remain without being sublimated, and enables an increase in size of the silicon carbide single crystal (for example, a single crystal wafer). The silicon carbide powder has a Blaine specific surface area of from 250 cm2/g to 1,000 cm2/g and a ratio of a silicon carbide powder having a particle size of more than 0.70 mm and 3.00 mm or less of 50 vol % or more with respect to a total amount of the silicon carbide powder. When a silicon carbide powder accommodated in a crucible is heated to be sublimated, a silicon carbide single crystal is formed on a seed crystal provided on an undersurface of a lid.
    Type: Grant
    Filed: November 27, 2013
    Date of Patent: November 14, 2017
    Assignees: TAIHEIYO CEMENT CORPORATION, NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY
    Inventors: Kenta Masuda, Kouki Ichitsubo, Masakazu Suzuki, Kiyoshi Nonaka, Tomohisa Kato, Hideaki Tanaka
  • Patent number: 9556035
    Abstract: A particle formed of silica and carbon having a low impurity content and an excellent reactivity is provided. Also provided is a method of producing a silica and carbon-containing material including: (B) a carbon mixing step of mixing an aqueous alkali silicate solution having a silicon concentration within the liquid portion of at least 10 wt % with carbon so as to obtain a carbon-containing aqueous alkali silicate solution; and (C) a silica recovery step of mixing the carbon-containing aqueous alkali silicate solution with a mineral acid so as to cause carbon and silicon within the liquid portion to precipitate as particles formed of silica and carbon and thus obtaining a particle-containing liquid substance, then solid-liquid separating the liquid substance so as to obtain a solid portion of a silica and carbon-containing material which is an assembly of particles formed of silica and carbon and a liquid portion containing impurities.
    Type: Grant
    Filed: July 3, 2012
    Date of Patent: January 31, 2017
    Assignee: TAIHEIYO CEMENT CORPORATION
    Inventors: Kouki Ichitsubo, Kenta Masuda, Masakazu Suzuki, Kohei Kawano, Jun Kumasaka
  • Patent number: 9382121
    Abstract: A high-purity silicon carbide powder and its production method enable mass production of the high-purity silicon carbide powder at low cost in a safe manner. The content of impurities in the silicon carbide powder is 500 ppm or less. The silicon carbide powder can be obtained by heating a raw material for silicon carbide production in an Acheson furnace using a heat generator. The raw material for silicon carbide production is prepared by mixing a siliceous raw material and a carbonaceous raw material. The raw material for silicon carbide production contains the siliceous raw material and the carbonaceous raw material at a mixture mole ratio (C/SiO2) of 2.5 to 4.0 and has a content of impurities of 120 ppm or less.
    Type: Grant
    Filed: August 23, 2012
    Date of Patent: July 5, 2016
    Assignee: TAIHEIYO CEMENT CORPORATION
    Inventors: Kenta Masuda, Kouki Ichitsubo, Kohei Kawano, Masakazu Suzuki, Jun Kumasaka, Hideaki Tanaka
  • Publication number: 20160160386
    Abstract: A silicon carbide powder which, when used as a raw material in a sublimation recrystallization method, enables improvement in productivity of a silicon carbide single crystal by exhibiting a high sublimation rate and allowing a small amount of silicon carbide to remain without being sublimated, and enables an increase in size of the silicon carbide single crystal (for example, a single crystal wafer). The silicon carbide powder has a Blaine specific surface area of from 250 cm2/g to 1,000 cm2/g and a ratio of a silicon carbide powder having a particle size of more than 0.70 mm and 3.00 mm or less of 50 vol % or more with respect to a total amount of the silicon carbide powder. When a silicon carbide powder accommodated in a crucible is heated to be sublimated, a silicon carbide single crystal is formed on a seed crystal provided on an undersurface of a lid.
    Type: Application
    Filed: November 27, 2013
    Publication date: June 9, 2016
    Inventors: Kenta MASUDA, Kouki ICHITSUBO, Masakazu SUZUKI, Kiyoshi NONAKA, Tomohisa KATO, Hideaki TANAKA
  • Publication number: 20140301933
    Abstract: A high-purity silicon carbide powder and its production method enable mass production of the high-purity silicon carbide powder at low cost in a safe manner. The content of impurities in the silicon carbide powder is 500 ppm or less. The silicon carbide powder can be obtained by heating a raw material for silicon carbide production in an Acheson furnace using a heat generator. The raw material for silicon carbide production is prepared by mixing a siliceous raw material and a carbonaceous raw material. The raw material for silicon carbide production contains the siliceous raw material and the carbonaceous raw material at a mixture mole ratio (C/SiO2) of 2.5 to 4.0 and has a content of impurities of 120 ppm or less.
    Type: Application
    Filed: August 23, 2012
    Publication date: October 9, 2014
    Applicant: TAIHEIYO CEMENT CORPORATION
    Inventors: Kenta Masuda, Kouki Ichitsubo, Kohei Kawano, Masakazu Suzuki, Jun Kumasaka, Hideaki Tanaka
  • Publication number: 20140227159
    Abstract: A particle formed of silica and carbon having a low impurity content and an excellent reactivity is provided. Also provided is a method of producing a silica and carbon-containing material including: (B) a carbon mixing step of mixing an aqueous alkali silicate solution having a silicon concentration within the liquid portion of at least 10 wt % with carbon so as to obtain a carbon-containing aqueous alkali silicate solution; and (C) a silica recovery step of mixing the carbon-containing aqueous alkali silicate solution with a mineral acid so as to cause carbon and silicon within the liquid portion to precipitate as particles formed of silica and carbon and thus obtaining a particle-containing liquid substance, then solid-liquid separating the liquid substance so as to obtain a solid portion of a silica and carbon-containing material which is an assembly of particles formed of silica and carbon and a liquid portion containing impurities.
    Type: Application
    Filed: July 3, 2012
    Publication date: August 14, 2014
    Applicant: TAIHEIYO CEMENT CORPORATION
    Inventors: Kouki Ichitsubo, Kenta Masuda, Masakazu Suzuki, Kohei Kawano, Atsushi Kumasaka
  • Patent number: 7722717
    Abstract: A hydraulic composition including: a ground burned product A having a hydraulic modulus (H.M.) of 1.8 to 2.3, a silica modulus (S.M.) of 1.3 to 2.3 and an iron modulus (I.M.) of 1.3 to 2.8; and a gypsum. The hydraulic composition is capable of reducing heat of hydration and producing a mortar or a concrete excellent in flowability and strength development.
    Type: Grant
    Filed: September 30, 2004
    Date of Patent: May 25, 2010
    Assignee: Taiheiyo Cement Corporation
    Inventors: Daisuke Sawaki, Susumu Sano, Kenichi Homma, Kouki Ichitsubo, Kenichi Matsumoto, Makihiko Ichikawa
  • Publication number: 20080276676
    Abstract: A soil improvement material comprising a ground burned product A and gypsum, the burned product A having a hydraulic modulus (H.M.) of 1.8 to 2.3, a silica modulus (S.M.) of 1.3 to 2.3, and an iron modulus (I.M.) of 1.3 to 2.8. The soil improvement material is useful for improving the ground, especially through solidifying soft soil, such as water-rich soil or organic-rich soil.
    Type: Application
    Filed: October 4, 2004
    Publication date: November 13, 2008
    Applicant: TAIHEIYO CEMENT CORPORATION
    Inventors: Daisuke Sawaki, Susumu Sano, Kenichi Homma, Kouki Ichitsubo, Kenichi Matsumoto, Makihiko Ichikawa
  • Publication number: 20070193477
    Abstract: A hydraulic composition including: a ground burned product A having a hydraulic modulus (H.M.) of 1.8 to 2.3, a silica modulus (S.M.) of 1.3 to 2.3 and an iron modulus (I.M.) of 1.3 to 2.8; and a gypsum. The hydraulic composition is capable of reducing heat of hydration and producing a mortar or a concrete excellent in flowability and strength development.
    Type: Application
    Filed: September 30, 2004
    Publication date: August 23, 2007
    Applicant: TAIHEIYO CEMENT CORPORATION
    Inventors: Daisuke Sawaki, Susumu Sano, Kenichi Homma, Kouki Ichitsubo, Kenichi Matsumoto, Makihiko Ichikawa