Patents by Inventor Nagao Fujikawa

Nagao Fujikawa 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 ceramic composition
    Patent number: 4014822
    Abstract: A semiconductor ceramic composition consists essentially of 83.95 to 98.65 mol% of barium titanate, 0.13 to 0.45 mol% of manganese oxide, 0.20 to 15 mol% of silicon dioxide and 0.23 to 1.65 mol% of one or more oxides selected from the group consisting of oxides of rare earth elements, bismuth and antimony, the content of one or more oxides of said group being 0.10 to 1.20 mol% greater than that of manganese oxide. The semiconductor ceramic composition has a markedly high positive resistance temperature characteristic.
    Type: Grant
    Filed: April 26, 1974
    Date of Patent: March 29, 1977
    Assignee: Murata Manufacturing Co., Ltd.
    Inventor: Nagao Fujikawa