Patents by Inventor Yohei KOZAKAI

Yohei KOZAKAI 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: 11749971
    Abstract: A metallic shell for a spark plug which metallic shell achieves suppressed elution of hexavalent chromium, and a spark plug including the metallic shell. The spark plug has a metallic shell. The metallic shell includes a tubular metallic shell body; a metal plating layer provided on a surface of the metallic shell body; and a chromium-containing chemical conversion coating layer provided to cover the metal plating layer. The chemical conversion coating layer has a zirconium component content of 0.1 mass % or more.
    Type: Grant
    Filed: February 15, 2023
    Date of Patent: September 5, 2023
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Takahiro Sanda, Keita Sugihara, Noriyasu Hasegawa, Yohei Kozakai
  • Publication number: 20230268722
    Abstract: A metallic shell for a spark plug which metallic shell achieves suppressed elution of hexavalent chromium, and a spark plug including the metallic shell. The spark plug has a metallic shell. The metallic shell includes a tubular metallic shell body; a metal plating layer provided on a surface of the metallic shell body; and a chromium-containing chemical conversion coating layer provided to cover the metal plating layer. The chemical conversion coating layer has a zirconium component content of 0.1 mass % or more.
    Type: Application
    Filed: February 15, 2023
    Publication date: August 24, 2023
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventors: Takahiro SANDA, Keita SUGIHARA, Noriyasu HASEGAWA, Yohei KOZAKAI
  • Patent number: 10431962
    Abstract: An ignition plug includes a metallic shell containing iron as a main component, carbon in an amount of 0.20 wt. % to 0.30 wt. %, manganese in an amount of 0.30 wt. % to 0.45 wt. %, and sulfur in an amount of 0.005 wt. % to 0.009 wt. %. The ratio of the manganese content (wt. %) to the sulfur content (wt. %); i.e., Mn/S is 40 to 65.
    Type: Grant
    Filed: July 10, 2017
    Date of Patent: October 1, 2019
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Taku Kato, Yohei Kozakai
  • Publication number: 20190237944
    Abstract: An ignition plug includes a metallic shell containing iron as a main component, carbon in an amount of 0.20 wt. % to 0.30 wt. %, manganese in an amount of 0.30 wt. % to 0.45 wt. %, and sulfur in an amount of 0.005 wt. % to 0.009 wt. %. The ratio of the manganese content (wt. %) to the sulfur content (wt. %); i.e., Mn/S is 40 to 65.
    Type: Application
    Filed: July 10, 2017
    Publication date: August 1, 2019
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventors: Taku KATO, Yohei KOZAKAI
  • Patent number: 10063036
    Abstract: A spark plug includes an insulator having an axial hole formed therethrough in the direction of an axis of the spark plug, a center electrode disposed in a front side of the axial hole and a metal shell disposed around an outer circumference of the insulator and having a collar-shaped tool engagement portion and a crimp portion located on a rear side of the tool engagement portion and reduced in diameter toward the rear, wherein the crimp portion of the metal shell is made of a carbon steel material having a grain size number equal to or greater than No. 11 as measured according to JIS G 0551.
    Type: Grant
    Filed: September 14, 2016
    Date of Patent: August 28, 2018
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Yohei Kozakai, Satoshi Nagasawa, Akira Suzuki
  • Publication number: 20170077681
    Abstract: A spark plug includes an insulator having an axial hole formed therethrough in the direction of an axis of the spark plug, a center electrode disposed in a front side of the axial hole and a metal shell disposed around an outer circumference of the insulator and having a collar-shaped tool engagement portion and a crimp portion located on a rear side of the tool engagement portion and reduced in diameter toward the rear, wherein the crimp portion of the metal shell is made of a carbon steel material having a grain size number equal to or greater than No. 11 as measured according to JIS G 0551.
    Type: Application
    Filed: September 14, 2016
    Publication date: March 16, 2017
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventors: Yohei KOZAKAI, Satoshi NAGASAWA, Akira SUZUKI