Patents by Inventor Takao Kawawa

Takao Kawawa 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).

  • Oxygen sensors
    Patent number: 4141812
    Abstract: There is disclosed an improved electrical contact structure between a solid electrolyte galvanic cell and a powder reference material for detecting the oxygen content of molten metals. The solid electrolyte galvanic cell has a portion embedded in the powder reference material and the portion is irregularly shaped so as to increase the contact area and strength of the joint between the embedded portion and the powder reference material.
    Type: Grant
    Filed: March 2, 1978
    Date of Patent: February 27, 1979
    Assignees: Nippon Kokan Kabushiki Kaisha, Osaka Oxygen Industries, Ltd.
    Inventors: Takao Kawawa, Ryoichiro Imai, Hisami Tokunaga, Yutaka Nakano, Naoaki Sasaki