Patents by Inventor Hideaki Tokunaga

Hideaki Tokunaga 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).

  • Varistor formed of bismuth and antimony and method of manufacturing same
    Patent number: 5592140
    Abstract: The varistor element contains zinc-oxide as a main constituent and at least bismuth and antimony as accessory constituents. The content of bismuth in the form of Bi.sub.2 O.sub.3 is in a range from about 0.1 to 4.0 mol % and the content of antimony in the form of Sb.sub.2 O.sub.3 constitutes a mol-ratio of Sb.sub.2 O.sub.3 /Bi.sub.2 O.sub.3 less than or equal to about 1.0 mol %. These materials are mixed thoroughly and are pressed into a compact. After coating both sides of the compact with Ag or Ag--Pd paste, the compact and its electrodes are sintered simultaneously at a temperature of about 800.degree. C. to 960.degree. C.
    Type: Grant
    Filed: September 29, 1994
    Date of Patent: January 7, 1997
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Hideaki Tokunaga, Yasuo Wakahata, Naoki Mutoh