Patents Represented by Law Firm Segner & Bretschneider
  • Spark plug with a sphere-like metal center electrode and manufacturing process thereof
    Patent number: 4393324
    Abstract: A spark plug with a sphere-like center discharge electrode is obtained by pressing a sphere-like metal essentially consisting of noble metal Au, Ag and/or alloys thereof with Pd or the like set on a small end bore formed at a discharge end bottom of a ceramic insulator. Sealing of a sealing material and/or resistor material together with setting (sealing) of a terminal body may be done simultaneously with the pressing of the sphere-like metal on the small end bore by means of hot-pressing applied on the terminal rod head.
    Type: Grant
    Filed: September 10, 1980
    Date of Patent: July 12, 1983
    Assignee: NGK Spark Plug Co.
    Inventors: Kanemitsu Nishio, Shunichi Takagi, Yasuhiko Suzuki