Patents by Inventor Iazuhisa Itakura

Iazuhisa Itakura 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).

  • Alumina-based sintered materials and process for producing the same
    Patent number: 6069105
    Abstract: Disclosed is an alumina-based sintered material comprising a magnesium component, a calcium component, a silicon component, and a lithium component, wherein the content of the lithium component in terms of oxide amount is from 0.002 to 0.04% by weight based on the alumina-based sintered material.
    Type: Grant
    Filed: April 1, 1999
    Date of Patent: May 30, 2000
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Yoshihiro Yamamoto, Katsura Matsubara, Toru Shimamori, Iazuhisa Itakura, Ken-ichi Mizuno