Patents Assigned to NGB Spark Plug Co., Ltd.
  • Patent number: 5006143
    Abstract: A method of joining a number of articles using a low-melting point glass whereby recesses in the layer of low-melting point glass initially formed before joining reduces the entrapment of bubbles within the glass layer. Preferably, the recesses are formed by protrusions in a mask used to form the coating of low-melting point glass prior to bonding.
    Type: Grant
    Filed: October 12, 1990
    Date of Patent: April 9, 1991
    Assignee: NGB Spark Plug Co., Ltd.
    Inventors: Hideyuki Kawase, Noboru Sahashi, Tamotsu Hashizume
  • Patent number: 4861625
    Abstract: A method of manufacturing a partially-glazed ceramic substrate for use in a thermal printing head. A ceramic substrate having a surface roughness of 0.2 .mu.m or less is provided. Subsequently, a glaze is applied to the ceramic substrate to form raised glaze regions having a transverse width of 1.0 mm or less and thickness of 100 .mu.m or less. The substrate and glaze are baked, and then a heating element is formed on the raised glaze regions.
    Type: Grant
    Filed: December 16, 1986
    Date of Patent: August 29, 1989
    Assignee: NGB Spark Plug Co., Ltd.
    Inventors: Kazuo Kondo, Tatsunori Kurachi
  • Patent number: 4844029
    Abstract: A heater for starting an engine is disclosed which comprises a cast body and a sheathed heating element embedded in the body at the time of casting thereof and is secured to the outside surface of the lubricating oil accumulation part of the engine or a transmission case. The cast body is mounted so as to close a hole provided in the outside surface of the lubricating oil accumulation part.
    Type: Grant
    Filed: June 3, 1986
    Date of Patent: July 4, 1989
    Assignee: NGB Spark Plug Co., Ltd.
    Inventor: Yasuhiko Suzuki
  • Patent number: 4672503
    Abstract: An electric field forming unit that has a long surface life, high reliability, and provides a uniform surface corona discharge along the entire length of the discharge electrode. The electric field forming unit includes a dielectric substrate made of a fine ceramic having a discharge electrode and an inductive electrode formed on opposite sides thereof. The discharge electrode has peripheral edges which are provided with a better linearity than a discharge electrode formed from an electroconductive paste by screen printing. The discharge electrode may be formed of a metalized tape in a thin line form.
    Type: Grant
    Filed: April 26, 1985
    Date of Patent: June 9, 1987
    Assignee: NGB Spark Plug Co., Ltd.
    Inventors: Senichi Masuda, Isamu Fukuura, Hisaharu Shiromizu, Naotoshi Morita