Patents by Inventor Tomoshi Matsumoto, deceased

Tomoshi Matsumoto, deceased 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 memory device
    Patent number: 5359561
    Abstract: A semiconductor memory device is provided which includes a plurality of data lines, at least one redundant data line, one common data line, a plurality of column switches installed between the plurality of data lines and the redundant data line and one common data line, and a column decoder for controlling the plurality of column switches. The column decoder operates to turn the column switch on. The column switch is connected to a plurality of data lines, excluding any defective data and redundant data lines during the test mode state.
    Type: Grant
    Filed: April 23, 1992
    Date of Patent: October 25, 1994
    Assignee: Hitachi, Ltd.
    Inventors: Shigetoshi Sakomura, Kazuya Ito, Hidetoshi Iwai, Toshiyuki Sakuta, Masamichi Ishihara, Tomoshi Matsumoto, deceased