Patents by Inventor Ayumi Kittaka

Ayumi Kittaka 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).

  • Semiconductor ceramics having negative temperature coefficients of resistance
    Publication number: 20010001205
    Abstract: A semiconductive ceramic having a negative temperature coefficient of resistance, includes an oxide of a rare earth transition element excluding Ce and including Y, with the addition of at least one of the following elements: Si, Zr, Hf, Ta, Sn, Sb, W, Mo, Te or Ce.
    Type: Application
    Filed: January 4, 2001
    Publication date: May 17, 2001
    Inventors: Terunobu Ishikawa, Akinori Nakayama, Hideaki Niimi, Hiroshi Takagi, Kunisaburo Tomono, Kimiyo Kittaka, Ayumi Kittaka, Megumi Kittaka