Patents by Inventor Shoma Tsumagari

Shoma Tsumagari 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: 11005237
    Abstract: An ignition plug comprising: an insulator having a through hole extending from a rear-end side toward a forward-end side; a center electrode inserted at least partially into a portion of the through hole on the forward-end side; a metal terminal member inserted at least partially into a portion of the through hole on the rear-end side; and a seal disposed within the through hole and in contact with the center electrode and an inner circumferential surface of the insulator. The seal contains a glass and an electrically conductive substance, and the glass contained in the seal contains Si in an amount of 50 mass % or more as reduced to SiO2 and Na in an amount of 0.1 mass % or more and less than 1 mass % as reduced to Na2O.
    Type: Grant
    Filed: June 16, 2020
    Date of Patent: May 11, 2021
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Seiji Nakano, Kengo Fujimura, Shoma Tsumagari
  • Publication number: 20200403386
    Abstract: An ignition plug comprising: an insulator having a through hole extending from a rear-end side toward a forward-end side; a center electrode inserted at least partially into a portion of the through hole on the forward-end side; a metal terminal member inserted at least partially into a portion of the through hole on the rear-end side; and a seal disposed within the through hole and in contact with the center electrode and an inner circumferential surface of the insulator. The seal contains a glass and an electrically conductive substance, and the glass contained in the seal contains Si in an amount of 50 mass % or more as reduced to SiO2 and Na in an amount of 0.1 mass % or more and less than 1 mass % as reduced to Na2O.
    Type: Application
    Filed: June 16, 2020
    Publication date: December 24, 2020
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventors: Seiji NAKANO, Kengo FUJIMURA, Shoma TSUMAGARI
  • Publication number: 20180358784
    Abstract: A spark plug has an insulator, a rod-shaped electrode member disposed in an axial hole of the insulator, and a cylindrical magnetic member disposed on an outer circumference of the electrode member within the axial hole. The insulator includes a large inner diameter region, a middle inner diameter region located frontward of the large inner diameter region and having an inner diameter smaller than that of the large inner diameter region, and a small inner diameter region located frontward of the middle inner diameter region and having an inner diameter smaller than that of the middle inner diameter region. The electrode member is retained on a step portion of the insulator between the middle inner diameter region and the small inner diameter region. The magnetic member is positioned in the axial hole at a location within the large inner diameter region.
    Type: Application
    Filed: June 6, 2018
    Publication date: December 13, 2018
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventors: Hironori UEGAKI, Shoma TSUMAGARI, Kazuhiro KUROSAWA, Katsuya TAKAOKA, Kuniharu TANAKA
  • Patent number: 10153622
    Abstract: A spark plug has an insulator, a rod-shaped electrode member disposed in an axial hole of the insulator, and a cylindrical magnetic member disposed on an outer circumference of the electrode member within the axial hole. The insulator includes a large inner diameter region, a middle inner diameter region located frontward of the large inner diameter region and having an inner diameter smaller than that of the large inner diameter region, and a small inner diameter region located frontward of the middle inner diameter region and having an inner diameter smaller than that of the middle inner diameter region. The electrode member is retained on a step portion of the insulator between the middle inner diameter region and the small inner diameter region. The magnetic member is positioned in the axial hole at a location within the large inner diameter region.
    Type: Grant
    Filed: June 6, 2018
    Date of Patent: December 11, 2018
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Hironori Uegaki, Shoma Tsumagari, Kazuhiro Kurosawa, Katsuya Takaoka, Kuniharu Tanaka