Patents by Inventor Chiharu Katsuyama

Chiharu Katsuyama 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: 7258771
    Abstract: The invention relates to an air/fuel ratio detection apparatus. This apparatus includes (a) a heater portion having an elongate cylindrical shape and heating by applying electricity thereto from outside; (b) a solid electrolyte layer surrounding the heater portion and being activated by heat to conduct oxygen ions therethrough; (c) first and second electrodes in contact with the solid electrolyte layer and being away from each other such that pumping voltage is applied by the first and second electrodes to the solid electrolyte layer; (d) a reference electrode for outputting an air/fuel ratio detection signal, the reference electrode being formed on the solid electrolyte layer and being away from the first and second electrodes; and (e) a diffusion layer made of a porous material and surrounding periphery of the solid electrolyte layer to cover the first and second electrodes and the reference electrode.
    Type: Grant
    Filed: August 14, 2002
    Date of Patent: August 21, 2007
    Assignee: Hitachi, Ltd.
    Inventors: Shigeo Isitani, Yasuji Orimo, Chiharu Katsuyama, Futoshi Ichiyanagi
  • Patent number: 7122103
    Abstract: The invention relates to an air/fuel ratio detection apparatus for a gas. This apparatus includes (a) a heater portion having an elongate cylindrical shape; (b) a solid electrolyte layer surrounding the heater portion and activated by heat to conduct oxygen ions therethrough; (c) a first electrode positioned between the heater portion and the solid electrolyte layer; (d) second and third electrodes in contact with an outer surface of the solid electrolyte layer and away from each other; (e) a first voltage applying device for applying a first voltage between the first and second electrodes; (f) a second voltage applying device for applying a second voltage between the first and third electrodes, the second voltage being higher than the first voltage; and (g) a diffusion layer made of a porous material and covering the second electrode to adjust transmission of the gas to the second electrode.
    Type: Grant
    Filed: March 31, 2003
    Date of Patent: October 17, 2006
    Assignee: Hitachi Ltd.
    Inventors: Shigeo Isitani, Futoshi Ichiyanagi, Yasuji Orimo, Chiharu Katsuyama
  • Publication number: 20030188967
    Abstract: The invention relates to an air/fuel ratio detection apparatus for a gas. This apparatus includes (a) a heater portion having an elongate cylindrical shape; (b) a solid electrolyte layer surrounding the heater portion and activated by heat to conduct oxygen ions therethrough; (c) a first electrode positioned between the heater portion and the solid electrolyte layer; (d) second and third electrodes in contact with an outer surface of the solid electrolyte layer and away from each other; (e) a first voltage applying device for applying a first voltage between the first and second electrodes; (f) a second voltage applying device for applying a second voltage between the first and third electrodes, the second voltage being higher than the first voltage; and (g) a diffusion layer made of a porous material and covering the second electrode to adjust transmission of the gas to the second electrode.
    Type: Application
    Filed: March 31, 2003
    Publication date: October 9, 2003
    Applicant: HITACHI UNISIA AUTOMOTIVE, LTD.
    Inventors: Shigeo Isitani, Futoshi Ichiyanagi, Yasuji Orimo, Chiharu Katsuyama
  • Publication number: 20030052004
    Abstract: The invention relates to an air/fuel ratio detection apparatus. This apparatus includes (a) a heater portion having an elongate cylindrical shape and heating by applying electricity thereto from outside; (b) a solid electrolyte layer surrounding the heater portion and being activated by heat to conduct oxygen ions therethrough; (c) first and second electrodes in contact with the solid electrolyte layer and being away from each other such that pumping voltage is applied by the first and second electrodes to the solid electrolyte layer; (d) a reference electrode for outputting an air/fuel ratio detection signal, the reference electrode being formed on the solid electrolyte layer and being away from the first and second electrodes; and (e) a diffusion layer made of a porous material and surrounding periphery of the solid electrolyte layer to cover the first and second electrodes and the reference electrode.
    Type: Application
    Filed: August 14, 2002
    Publication date: March 20, 2003
    Applicant: UNISIA JECS CORPORATION
    Inventors: Shigeo Isitani, Yasuji Orimo, Chiharu Katsuyama, Futoshi Ichiyanagi