Patents by Inventor Atsuhiro Torii

Atsuhiro Torii 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).

  • Method for preparing perovskite complex oxide powder of formula ABO3
    Patent number: 7556792
    Abstract: Ba(OH)2.8H2O is fused by heating. The fused Ba(OH)2 is allowed to react with TiO2 powder having a specific surface area of 250 m2/g or more to prepare a cubic crystalline BaTiO3 having high crystallinity. The BaTiO3 is calcined to yield a fine, tetragonal crystalline BaTiO3 powder having high crystallinity. Thus, a high quality BaTiO3 having high crystallinity can be prepared at a low cost.
    Type: Grant
    Filed: December 30, 2002
    Date of Patent: July 7, 2009
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Atsuhiro Torii, Shinichi Kato, Tomohisa Tonogaki, Masaru Kojima, Kenji Tanaka
  • Method for preparing complex oxide and complex oxide prepared thereby
    Publication number: 20040028601
    Abstract: Ba(OH)2.8H2O is fused by heating. The fused Ba(OH)2 is allowed to react with TiO2 powder having a specific surface area of 250 m2/g or more to prepare a cubic crystalline BaTiO3 having high crystallinity. The BaTiO3 is calcined to yield a fine, tetragonal crystalline BaTiO3 powder having high crystallinity. Thus, a high quality BaTiO3 having high crystallinity can be prepared at a low cost.
    Type: Application
    Filed: December 30, 2002
    Publication date: February 12, 2004
    Inventors: Atsuhiro Torii, Shinichi Kato, Tomohisa Tonogaki, Masaru Kojima, Kenji Tanaka
  • Ceramic slurry composition, ceramic green sheet and multilayer ceramic electronic part
    Patent number: 6524693
    Abstract: A ceramic green sheet is formed from a ceramic slurry composition comprising a ceramic powder such as BaTiO3, a vehicle in the state of emulsion in which an organic binder consisting of polyurethane resin particles having an average particle size of about 120 nm or less is dispersed in an aqueous solvent, and a surfactant comprising an alkyne glycol having one or more triple bonds in its molecule and/or an ethylene oxide addition product of such an alkyne glycol. A very thin aqueous ceramic green sheet is provided that is free from pin holes, and has low surface roughness, high tensile strength and high elongation.
    Type: Grant
    Filed: December 24, 2001
    Date of Patent: February 25, 2003
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Norihiro Yoshikawa, Tomoaki Onoue, Atsuhiro Torii, Kenji Tanaka, Masaru Kojima
  • Ceramic slurry composition, ceramic green sheet and multilayer ceramic electronic part
    Publication number: 20020122924
    Abstract: A ceramic green sheet is formed from a ceramic slurry composition comprising a ceramic powder such as BaTiO3 a vehicle in the state of emulsion in which an organic binder consisting of polyurethane resin particles having an average particle size of about 120 nm or less is dispersed in an aqueous solvent, and a surfactant comprising an alkyne glycol having one or more triple bonds in its molecule and/or an ethylene oxide addition product of such an alkyne glycol. A very thin aqueous ceramic green sheet is provided that is free from pin holes, and has low surface roughness, high tensile strength and high elongation.
    Type: Application
    Filed: December 24, 2001
    Publication date: September 5, 2002
    Applicant: Murata Manufacturing Co., Ltd.
    Inventors: Norihiro Yoshikawa, Tomoaki Onoue, Atsuhiro Torii, Kenji Tanaka, Masaru Kojima