Patents by Inventor Zenji Ishikawa

Zenji Ishikawa 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: 6647779
    Abstract: A temperature sensing resistance element includes a substrate made of an insulating material, a temperature sensing resistor formed on at least a part of the outer peripheral surface of the substrate to connect both ends of the substrate, a cap-shaped conducting member being electrically connected to the temperature sensing resistor and disposed at each end of the substrate, and a protective film covering at least the temperature sensing resistor. A gap is defined by an inner surface an enlarged portion of the conducting member and a part of the outer surface of the substrate, and the gap is widened gradually toward the end of the opening of the conducting member.
    Type: Grant
    Filed: May 28, 2002
    Date of Patent: November 18, 2003
    Assignee: NGK Insulators, Ltd.
    Inventors: Fujio Ishiguro, Zenji Ishikawa
  • Publication number: 20020189342
    Abstract: The temperature sensing resistance element comprises a substrate made of an insulating material, a temperature sensing resistor formed on at least a part of the outer peripheral surface of the substrate so as to connect both ends of the substrate, a cap-shaped conducting member being electrically connected to the temperature sensing resistor and disposed at each end of the substrate, and a protective film covering at least the temperature sensing resistor. There is provided with a gap which is defined by an inner surface of the enlarged portion and a part of the outer surface of the substrate, and is widened gradually toward the end of the opening of the conducting member.
    Type: Application
    Filed: May 28, 2002
    Publication date: December 19, 2002
    Applicant: NGK Insulators, Ltd.
    Inventors: Fujio Ishiguro, Zenji Ishikawa
  • Patent number: 5315871
    Abstract: A thermal flowmeter for determining a parameter of a fluid flowing through a passage, including a detecting element, and a pair of electrically conductive supports fixed to a wall defining the passage for supporting the detecting element. The detecting element includes a substrate, an electrically resistive body disposed on the substrate and having an electrical resistance which varies with an ambient temperature, and a pair of electrical conductors provided at opposite ends of the support and electrically connected to the electrically resistive body. The detecting element is positioned in the passage such that the electrical conductors are secured to the electrically conductive supports. The electrically conductive supports have respective engaging portions which engage the electrical conductors, respectively, for positioning the detecting element with respect to the wall of the passage.
    Type: Grant
    Filed: March 26, 1993
    Date of Patent: May 31, 1994
    Assignee: NGK Insulators, Ltd.
    Inventors: Yasuhito Yajima, Zenji Ishikawa, Syuichi Yamauchi
  • Patent number: 5280264
    Abstract: A resistor element for determining a parameter, including a ceramic support, an electrically resistive body formed on the ceramic support, at least one lead wire electrically connected to the electrically resistive body, and an adhesive containing platinum for securing the lead wire(s) to the ceramic support. Each lead wire includes a wire rod having a lower thermal conductivity than platinum, and a covering layer which covers the wire rod and is formed of an alloy including platinum as a major component.
    Type: Grant
    Filed: August 13, 1992
    Date of Patent: January 18, 1994
    Assignee: NGK Insulators, Ltd.
    Inventors: Yasuhito Yajima, Fujio Ishiguro, Zenji Ishikawa
  • Patent number: 5224378
    Abstract: A thermal flowmeter for determining a parameter of a fluid flowing through a passage, including a detecting element, and a pair of electrically conductive supports fixed to a wall defining the passage for supporting the detecting element. The detecting element includes a substrate, an electrically resistive body disposed on the substrate and having an electrical resistance which varies with an ambient temperature, and a pair of electrical conductors provided at opposite ends of the support and electrically connected to the electrically resistive body. The detecting element is positioned in the passage such that the electrical conductors are secured to the electrically conductive supports. The electrically conductive supports have respective engaging portions which engage the electrical conductors, respectively, for positioning the detecting element with respect to the wall of the passage.
    Type: Grant
    Filed: May 24, 1991
    Date of Patent: July 6, 1993
    Assignee: NGK Insulators, Ltd.
    Inventors: Yasuhito Yajima, Zenji Ishikawa, Syuichi Yamauchi
  • Patent number: 5168256
    Abstract: A resistor element for determining a parameter, including a ceramic support having a bearing surface, an electrically resistive body formed on the bearing surface of the ceramic support, a conductor or conductors electrically connected to the electrically resistive body, the conductor(s) having a lower thermal conductivity than a conductor made of platinum, and an adhesive for securing the conductor(s) to the ceramic support. The conductor is defined by a lead wire made of an alloy and a covering layer made of a metal which covers the lead wire. The adhesive contains at least one metal of which at least an outer surface of each conductor is formed, so as to increase bonding strength between the conductor(s) and the adhesive.
    Type: Grant
    Filed: March 13, 1991
    Date of Patent: December 1, 1992
    Assignee: NGK Insulators, Ltd.
    Inventors: Fujio Ishiguro, Zenji Ishikawa