Patents by Inventor Junji Tajima

Junji Tajima 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 with improved capacitor structure
    Patent number: 4931849
    Abstract: A semiconductor device provided with capacitors which have accurate and reliable capacitance ratio, is disclosed. The semiconductor device comprises first and second capacitors. The first and second capacitors have substantially the same physical configuration but they have different dielectric layers of different values of dielectric constant. Thus, a capacitance ratio of the first capacitor to the second capacitor is determined in accordance with the dielectric constant ratio of the dielectric layers thereof.
    Type: Grant
    Filed: July 18, 1988
    Date of Patent: June 5, 1990
    Assignee: NEC Corporation
    Inventor: Junji Tajima