Patents by Inventor Tetuo Toyama

Tetuo Toyama 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).

  • Mo.sub.5 Si.sub.3 C ceramic material and glow plug heating element made of the same
    Patent number: 5086210
    Abstract: An electrically conductive ceramic material containing at least 20 wt % of Mo.sub.5 Si.sub.3 C and having a resistance-temperature coefficient no greater than 5.times.10.sup.-4 deg.sup.-1 is used to make the heating element of a self-controlling type glow plug having a resistor with a larger temperature-resistance coefficient, such as iron or nickel, connected in series to the heating element for controlling the supply of electric current to the heating element. The ceramic material is made by firing a ceramic powder mixture of Mo and Si mixed with carbon black.
    Type: Grant
    Filed: March 28, 1989
    Date of Patent: February 4, 1992
    Assignees: Nippondenso Co., Ltd., Nippon Soken, Inc.
    Inventors: Naochika Nunogaki, Tetuo Toyama, Nobuei Ito