Patents by Inventor Takeru Wakamatsu

Takeru Wakamatsu 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).

  • Spark plug and internal combustion engine equipped with the spark plug
    Patent number: 7150252
    Abstract: In a spark plug 100, the nickel content of a center electrode 20 is greater than that of a ground electrode 30. This enhances resistance to spark-induced consumption of the center electrode 20. Also, the ground electrode 30 to which a noble-metal chip 91 is joined exhibits high resistance to spark-induced consumption. Accordingly, the spark plug 100 can be attached to either of a negative-polarity cylinder in which the center electrode 20 assumes a negative polarity, and a positive-polarity cylinder in which the center electrode 20 assumes a positive polarity. The noble-metal chip 91 is joined only to the ground electrode 30, and a noble-metal chip is not joined to the center electrode 20.
    Type: Grant
    Filed: March 22, 2006
    Date of Patent: December 19, 2006
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Yoshihisa Sugiyama, Katsutoshi Nakayama, Takeru Wakamatsu
  • Spark plug and internal combustion engine equipped with the spark plug
    Publication number: 20060213474
    Abstract: In a spark plug 100, the nickel content of a center electrode 20 is greater than that of a ground electrode 30. This enhances resistance to spark-induced consumption of the center electrode 20. Also, the ground electrode 30 to which a noble-metal chip 91 is joined exhibits high resistance to spark-induced consumption. Accordingly, the spark plug 100 can be attached to either of a negative-polarity cylinder in which the center electrode 20 assumes a negative polarity, and a positive-polarity cylinder in which the center electrode 20 assumes a positive polarity. The noble-metal chip 91 is joined only to the ground electrode 30, and a noble-metal chip is not joined to the center electrode 20.
    Type: Application
    Filed: March 22, 2006
    Publication date: September 28, 2006
    Inventors: Yoshihisa Sugiyama, Katsutoshi Nakayama, Takeru Wakamatsu