Patents by Inventor Hironari Shoji

Hironari Shoji 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).

  • Patent number: 6074970
    Abstract: A multilayer ceramic capacitor is produced by using a dielectric ceramic composition prepared by allowing a composition represented by the composition formula (Ba.sub.1-x Ca.sub.x)TiO.sub.3 (provided that 0.005.ltoreq.x.ltoreq.0.05), namely, 0.5-5 mol % to contain an additive of MnO--CoO--MgO at 0.2 to 2 mol % and a Y.sub.2 O.sub.3 additive at 2.5 mol % or less and further adding a glass component comprising SiO.sub.2 --Al.sub.2 O.sub.3 --BaO--CaO--Ta.sub.2 O.sub.5 at 0.5 to 5 mol % to the resulting composition. The dielectric ceramic composition can be prepared into slurry well by using an aqueous binder and can be sintered well with no occurrence of any crack even by fast firing, and even after barrel treatment, additionally, chipping hardly occurs in the dielectric ceramic composition. Accordingly, the resulting multilayer ceramic capacitor exerts an excellent breakdown voltage even at a large size and can therefore satisfy the JIS B characteristic.
    Type: Grant
    Filed: December 11, 1998
    Date of Patent: June 13, 2000
    Assignees: Kabushiki Kaisha Toshiba, Nippon Chemi-Con Corporation
    Inventors: Yohashi Yamashita, Hideyuki Kanai, Hironari Shoji, Yuichi Nakano