Patents by Inventor Hiroshi Watanbe

Hiroshi Watanbe 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).

  • Electrically conductive oxide sintered compact, thermistor element employing the same, and temperature sensor employing the same
    Patent number: 8617432
    Abstract: A sintered electroconductive oxide forming a thermistor element has a first crystal phase having a composition represented by RE14Al2O9 and a second crystal phase having a perovskite structure represented by (RE21-aSLa)MO3. The factor a of the second crystal phase is: 0.18<a<0.50, wherein RE1 represents at least one of Yb and Lu and at least one species selected from among group 3A elements excluding Yb, Lu, and La; RE2 represents at least one species selected from among group 3A elements excluding La and which contains at least one species selected from the group RE1; M represents Al and at least one species selected from group 4A to 7A, and 8 elements; and SL represents Sr, Ca, and Mg, with at least Sr being included at a predominant proportion by mole.
    Type: Grant
    Filed: February 18, 2010
    Date of Patent: December 31, 2013
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Yasuyuki Okimura, Shinji Ban, Hiroshi Watanbe, Takeshi Mitsuoka