Patents by Inventor Daisuke SUMOYAMA, SR.

Daisuke SUMOYAMA, SR. 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).

  • Publication number: 20180166863
    Abstract: A spark plug having a tip provided on at least one of a center electrode and a ground electrode. The tip includes a body portion, a coating layer, and a high specific resistance layer. The body portion contains mostly Ir. The high specific resistance layer is provided on a side peripheral surface of the body portion, has a Ni content greater than the Ni content of the body portion and less than 50 mass %, and has a thickness of 2 ?m or greater and 45 ?m or less. The coating layer is provided on a side peripheral surface of the high specific resistance layer, contains 50 mass % or more of Ni, and has a thickness of 3 ?m or greater and 20 ?m or less. The tip has a specific resistance of 20×10?8 ?m or less at room temperature.
    Type: Application
    Filed: May 16, 2016
    Publication date: June 14, 2018
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventors: Daisuke SUMOYAMA, SR., Takuto NAKADA