Patents by Inventor Naoki Shirakawa

Naoki Shirakawa 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: 7134785
    Abstract: A capacitance temperature sensor in which temperature is measured by detecting capacitance of a parallel plate condenser which comprises a dielectric material comprising strontium titanate single crystal in which (a) 30% by weight or less of oxygen-16 or (b) 30% by weight to 50% by weight of oxygen-16 is substituted with oxygen-18 isotope.
    Type: Grant
    Filed: April 26, 2005
    Date of Patent: November 14, 2006
    Assignee: National Institute of Advanced Industrial Science and Technology
    Inventors: Hiroshi Takashima, Akira Shoji, Ruiping Wang, Naoki Shirakawa, Mitsuru Itoh
  • Publication number: 20050238081
    Abstract: A capacitance temperature sensor in which temperature is measured by detecting capacitance of a parallel plate condenser which comprises a dielectric material comprising strontium titanate single crystal in which (a) 30% by weight or less of oxygen-16 or (b) 30% by weight to 50% by weight of oxygen-16 is substituted with oxygen-18 isotope.
    Type: Application
    Filed: April 26, 2005
    Publication date: October 27, 2005
    Inventors: Hiroshi Takashima, Akira Shoji, Ruiping Wang, Naoki Shirakawa, Mitsuru Itoh
  • Patent number: 6768300
    Abstract: An apparatus for measuring electromagnetic characteristics includes a sample rod with a sample fixed to a lower part thereof, a helium 3 refrigerator, in which the sample rod is inserted, having a main pipe that forms around the sample rod a space that is cooled by helium 3, a device for supplying helium 3 to the helium 3 refrigerator, an inner tube portion, into which the main pipe is inserted, that supports at an upper part thereof the refrigerator, an outer tube that cools an outer periphery of the inner tube with helium, a liquid helium container that supplies liquid helium to the outer tube, and a device for measuring the electromagnetic characteristics of the sample.
    Type: Grant
    Filed: November 19, 2002
    Date of Patent: July 27, 2004
    Assignee: National Institute of Advanced Industrial Science and Technology
    Inventors: Naoki Shirakawa, Shinichi Ikeda
  • Patent number: 6699449
    Abstract: This invention relates to a process for the production of an oxide of a metal A by heating precursors of the oxide of a metal A, in the presence of an oxygen partial pressure control agent comprising an oxide of a metal B that is capable of assuming multiple valence numbers. The process is carried out under a condition that an ionization tendency relationship of Ai+<Bj+<A0 is satisfied, where i is a valence number of the metal A in the oxide to be produced and j is a valence number of the metal B in the oxygen partial pressure control agent.
    Type: Grant
    Filed: December 12, 2000
    Date of Patent: March 2, 2004
    Assignee: Agency of Industrial Science & Technology, Ministry of International Trade & Industry
    Inventors: Naoki Shirakawa, Shin-Ichi Ikeda, Hiroshi Bando
  • Patent number: 6642591
    Abstract: A field-effect transistor includes a silicon substrate on which is formed a channel region, a source region and a drain region. A gate insulation layer of a transition metal oxide having a perovskite structure is formed over at least the channel region, and a gate electrode is provided on the gate insulation layer.
    Type: Grant
    Filed: December 29, 2000
    Date of Patent: November 4, 2003
    Assignees: Agency of Industrial Science and Technology
    Inventors: Shin-Ichi Ikeda, Naoki Shirakawa, Hiroshi Bando, Eiichi Suzuki
  • Patent number: 6589449
    Abstract: A high-melting-point conductive oxide includes a mixture of a powdered Sr compound and Ru compound and/or Ru metal. The mixture is sintered at a primary temperature of 900° C. to 1300° C. in an atmosphere containing oxygen to form a sintered body that is pulverized back to a powder. The powder is given a desired shape that is again sintered, this time at a secondary temperature of 1000° C. to 1500° C. higher than the primary temperature, again in an atmosphere containing oxygen. The high-melting point conductive oxide is used as a heating element for high-temperature use, an electrode material for high-temperature use, a material for high-temperature thermocouple use and a light-emitting material for high-temperature use.
    Type: Grant
    Filed: December 29, 2000
    Date of Patent: July 8, 2003
    Assignees: National Institute of Advanced Industrial Science and Technology
    Inventors: Shinichi Ikeda, Naoki Shirakawa, Hiroshi Bando
  • Publication number: 20030122543
    Abstract: An apparatus for measuring electromagnetic characteristics includes a sample rod with a sample fixed to a lower part thereof, a helium 3 refrigerator, in which the sample rod is inserted, having a main pipe that forms around the sample rod a space that is cooled by helium 3, a device for supplying helium 3 to the helium 3 refrigerator, an inner tube portion, into which the main pipe is inserted, that supports at an upper part thereof the refrigerator, an outer tube that cools an outer periphery of the inner tube with helium, a liquid helium container that supplies liquid helium to the outer tube, and a device for measuring the electromagnetic characteristics of the sample.
    Type: Application
    Filed: November 19, 2002
    Publication date: July 3, 2003
    Applicant: National Inst. of Advanced Ind. Science and Tech.
    Inventors: Naoki Shirakawa, Shinichi Ikeda
  • Publication number: 20030107043
    Abstract: An electrically conductive high-melting-point oxide light source that can be used in an oxygen-containing atmosphere includes a sintered oxide having as an essential constituent an oxide of an element selected from the group consisting of ruthenium, iridium, rhodium and rhenium. It is used an oxygen-containing atmosphere at a temperature of not less than 1700° C. A high-melting-point conductive paste includes particles of a sintered oxide having as an essential constituent an oxide of an element selected from the group consisting of ruthenium, iridium, rhodium and rhenium, and a binder and solvent. An exhaust gas filter includes a powdered sintered oxide having as an essential constituent an oxide of an element selected from the group consisting of ruthenium, iridium, rhodium and rhenium, the powdered sintered oxide being applied to and baked on, or formed into a heating element and attached to, a surface of a diesel engine exhaust gas filter of ceramic to form a heating element.
    Type: Application
    Filed: December 6, 2002
    Publication date: June 12, 2003
    Applicant: National Inst. of Advanced Ind. Science and Tech.
    Inventors: Shinichi Ikeda, Yasumoto Tanaka, Naoki Shirakawa, Hiroshi Bando
  • Publication number: 20020021998
    Abstract: A method of synthesizing metallic oxides, when synthesizing an oxide of a metal A, controls oxygen partial pressure by using an oxygen partial pressure control agent containing an oxide of a metal B capable of assuming multiple valence numbers. The method satisfies an ionization tendency relationship of A1+<Bj+<A0, where i is the valence number of the metal A in the oxide to be synthesized and j is the valence number of the metal B in the oxygen partial pressure control agent.
    Type: Application
    Filed: December 12, 2000
    Publication date: February 21, 2002
    Applicant: AGENCY OF INDUSTRIAL SCIENCE & TECHNOLOGY, MINISTRY OF INTERNATIONAL TRADE & INDUSTRY
    Inventors: Naoki Shirakawa, Shin-Ichi Ikeda, Hiroshi Bando
  • Publication number: 20020003271
    Abstract: A field-effect transistor includes a silicon substrate on which is formed a channel region, a source region and a drain region. A gate insulation layer of a transition metal oxide having a perovskite structure is formed over at least the channel region, and a gate electrode is provided on the gate insulation layer.
    Type: Application
    Filed: December 29, 2000
    Publication date: January 10, 2002
    Inventors: Shin-Ichi Ikeda, Naoki Shirakawa, Hiroshi Bando, Eiichi Suzuki
  • Publication number: 20010050355
    Abstract: A high-melting-point conductive oxide includes a mixture of a powdered Sr compound and Ru compound or Ru metal. The mixture is sintered at a primary temperature of 900° C. to 1300° C. in an atmosphere containing oxygen to form a sintered body that is pulverized back to a powder. The powder is given a desired shape and is again sintered, this time at a secondary temperature of 1000° C. to 1500° C. higher than the primary temperature, again in an atmosphere containing oxygen. The high-melting point conductive oxide is used as a heating element for high-temperature use, an electrode material for high-temperature use, a material for high-temperature thermocouple use and a light-emitting material for high-temperature use.
    Type: Application
    Filed: December 29, 2000
    Publication date: December 13, 2001
    Inventors: Shinichi Ikeda, Naoki Shirakawa, Hiroshi Bando
  • Patent number: 5663365
    Abstract: A process for the preparation of pyrazolone derivatives represented by the general formula ##STR1## wherein R is a hydrogen atom, an alkyl group, an allyl group, an aryl group or an aralkyl group, and R.sub.1 and R.sub.2 are, respectively, a hydrogen atom, an alkyl group or a phenyl group which may have a substituent, comprising reacting a 2,3-dihalocarboxylic acid derivative or a 2-haloacrylic acid derivative with a hydrazine derivative. A pyrazolone or 1-substituted-3-pyrazolones useful as intermediate starting materials for the synthesis of agricultural chemicals, medicine and chemical compounds can be easily and cheaply prepared from widely used industrial starting materials.
    Type: Grant
    Filed: October 29, 1996
    Date of Patent: September 2, 1997
    Assignee: Japan Hydrazine Co., Ltd.
    Inventors: Yasuo Yamamoto, Naoki Shirakawa, Shinichi Takano, Yoshio Kawai