Patents by Inventor Tamotu Miyachi

Tamotu Miyachi 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).

  • Process for producing compact silicon nitride ceramics
    Patent number: 4205033
    Abstract: A process for producing a compact silicon nitride ceramic product which comprises molding a powder mixture of Si.sub.3 N.sub.4, Ta.sub.2 O.sub.5 and Al.sub.2 O.sub.3 in proportions defined by the region A, B, C, D in the FIGURE within the ranges of 65.0 to 96.0% by volume Si.sub.3 N.sub.4, 1.0 to 32.0% by volume Ta.sub.2 O.sub.5 and 3.0 to 20.0% by volume Al.sub.2 O.sub.3, and then firing the powder mixture in a non-oxidizing atmosphere containing a carbon compound; or hot-pressing the powder mixture; in a graphite mold.
    Type: Grant
    Filed: August 22, 1978
    Date of Patent: May 27, 1980
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Yoshinori Hattori, Tamotu Miyachi