Patents by Inventor Toshihisa Tsukuda

Toshihisa Tsukuda 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).

  • Method of manufacturing a semiconductor device
    Patent number: 5472891
    Abstract: This invention discloses EEPROM which increases an erasing voltage V.sub.pp to be applied in a data write cycle by increasing an avalanche breakdown voltage between a source region and a semiconductor substrate in order to improve erasing efficiency, and employs a structure which strengthens the electric field at the edge of a drain region in order to let hot carrier be easily generated and to improve writing efficiency.
    Type: Grant
    Filed: June 14, 1994
    Date of Patent: December 5, 1995
    Assignee: Hitachi, Ltd.
    Inventors: Kazuhiro Komori, Satoshi Meguro, Takaaki Hagiwara, Hitoshi Kume, Toshihisa Tsukuda, Hideaki Yamamoto