Patents by Inventor Shigekazu Onozumi

Shigekazu Onozumi 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: 10106691
    Abstract: To be provided is a metal paste from which an electrode having high electrode activity as a sensor electrode of various gas sensors can be produced. The present invention is a metal paste for forming a gas sensor electrode obtained by dispersing a conductive particle including Pt or a Pt alloy and a ceramic powder including zirconia or stabilized zirconia, or any of zirconia and stabilized zirconia and one or more oxides of La, Ce, Pr, Nd, Sm, and Hf in a solvent, the metal paste further including an inorganic oxide particle containing alumina and an insoluble particle that is insoluble in the solvent, in which 0.5 or more to 3.0 mass % or less of the inorganic oxide particle and 1.0 to 5.0 mass % of the insoluble particle are dispersed based on the mass of the solid content of the conductive particle, the ceramic powder, the inorganic oxide particle, and the insoluble particle.
    Type: Grant
    Filed: July 27, 2017
    Date of Patent: October 23, 2018
    Assignee: TANAKA KIKINZOKU KOGYO K.K.
    Inventors: Nobuhisa Okamoto, Takuya Hosoi, Nobuyuki Akiyama, Akihiro Nakai, Shigekazu Onozumi
  • Publication number: 20170328860
    Abstract: To be provided is a metal paste from which an electrode having high electrode activity as a sensor electrode of various gas sensors can be produced. The present invention is a metal paste for forming a gas sensor electrode obtained by dispersing a conductive particle including Pt or a Pt alloy and a ceramic powder including zirconia or stabilized zirconia, or any of zirconia and stabilized zirconia and one or more oxides of La, Ce, Pr, Nd, Sm, and Hf in a solvent, the metal paste further including an inorganic oxide particle containing alumina and an insoluble particle that is insoluble in the solvent, in which 0.5 or more to 3.0 mass % or less of the inorganic oxide particle and 1.0 to 5.0 mass % of the insoluble particle are dispersed based on the mass of the solid content of the conductive particle, the ceramic powder, the inorganic oxide particle, and the insoluble particle.
    Type: Application
    Filed: July 27, 2017
    Publication date: November 16, 2017
    Inventors: Nobuhisa OKAMOTO, Takuya HOSOI, Nobuyuki AKIYAMA, Akihiro NAKAI, Shigekazu ONOZUMI
  • Patent number: 9758680
    Abstract: To be provided is a metal paste from which an electrode having high electrode activity as a sensor electrode of various gas sensors can be produced. The present invention is a metal paste for forming a gas sensor electrode obtained by dispersing a conductive particle including Pt or a Pt alloy and a ceramic powder including zirconia or stabilized zirconia, or any of zirconia and stabilized zirconia and one or more oxides of La, Ce, Pr, Nd, Sm, and Hf in a solvent, the metal paste further including an inorganic oxide particle containing alumina and an insoluble particle that is insoluble in the solvent, in which 0.5 or more to 3.0 mass % or less of the inorganic oxide particle and 1.0 to 5.0 mass % of the insoluble particle are dispersed based on the mass of the solid content of the conductive particle, the ceramic powder, the inorganic oxide particle, and the insoluble particle.
    Type: Grant
    Filed: January 27, 2014
    Date of Patent: September 12, 2017
    Assignee: TANAKA KIKINZOKU KOGYO K.K.
    Inventors: Nobuhisa Okamoto, Takuya Hosoi, Nobuyuki Akiyama, Akihiro Nakai, Shigekazu Onozumi
  • Patent number: 9585250
    Abstract: [Problem to be solved] The present invention provides a conductive paste for constrained firing and a ceramic substrate manufactured with the conductive paste, the conductive paste having an excellent plating resistance and a good adherence against a ceramic substrate and a plated film even after plating treatment, wherein a constraining layer after firing can be easily removed without remaining on a surface conductor in a case where co-firing is performed. [Solution] Provided is a conductive paste comprising 60 to 95 mass % of an Ag powder as the content in a paste composition, 0.5 to 5 mass % of a borosilicate based glass powder relative to the Ag powder, the remainder being a platinum group metal additive and an organic vehicle, wherein the platinum group metal additive contains at least two metals of Ru and Rh, and the content of Ru and the content of Rh in the platinum group metal additive are 0.05 to 5 mass % of Ru and 0.001 to 0.
    Type: Grant
    Filed: October 2, 2013
    Date of Patent: February 28, 2017
    Assignees: TDK Corporation, Tanaka Kikinzoku Kogyo K.K.
    Inventors: Minoru Sato, Tomoaki Kawata, Masahiro Hirano, Shigekazu Onozumi
  • Publication number: 20150353742
    Abstract: To be provided is a metal paste from which an electrode having high electrode activity as a sensor electrode of various gas sensors can be produced. The present invention is a metal paste for forming a gas sensor electrode obtained by dispersing a conductive particle including Pt or a Pt alloy and a ceramic powder including zirconia or stabilized zirconia, or any of zirconia and stabilized zirconia and one or more oxides of La, Ce, Pr, Nd, Sm, and Hf in a solvent, the metal paste further including an inorganic oxide particle containing alumina and an insoluble particle that is insoluble in the solvent, in which 0.5 or more to 3.0 mass % or less of the inorganic oxide particle and 1.0 to 5.0 mass % of the insoluble particle are dispersed based on the mass of the solid content of the conductive particle, the ceramic powder, the inorganic oxide particle, and the insoluble particle.
    Type: Application
    Filed: January 27, 2014
    Publication date: December 10, 2015
    Inventors: Nobuhisa OKAMOTO, Takuya HOSOI, Nobuyuki AKIYAMA, Akihiro NAKAI, Shigekazu ONOZUMI
  • Publication number: 20150282309
    Abstract: [Problem to be solved] The present invention provides a conductive paste for constrained firing and a ceramic substrate manufactured with the conductive paste, the conductive paste having an excellent plating resistance and a good adherence against a ceramic substrate and a plated film even after plating treatment, wherein a constraining layer after firing can be easily removed without remaining on a surface conductor in a case where co-firing is performed. [Solution] Provided is a conductive paste comprising 60 to 95 mass % of an Ag powder as the content in a paste composition, 0.5 to 5 mass % of a borosilicate based glass powder relative to the Ag powder, the remainder being a platinum group metal additive and an organic vehicle, wherein the platinum group metal additive contains at least two metals of Ru and Rh, and the content of Ru and the content of Rh in the platinum group metal additive are 0.05 to 5 mass % of Ru and 0.001 to 0.
    Type: Application
    Filed: October 2, 2013
    Publication date: October 1, 2015
    Applicants: TANAKA KIKINZOKU KOGYO K.K., TDK CORPORATION
    Inventors: Minoru Sato, Tomoaki Kawata, Masahiro Hirano, Shigekazu Onozumi