Patents by Inventor Tatuo Harada

Tatuo Harada 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: 5835985
    Abstract: A reverse conducting gate-turnoff thyristor includes a switching device section, a diode section, and an isolating section located between the switching device section and the diode section. The isolating section includes an impurity layer formed by controlling impurity diffusion and having an impurity concentration lower than those of the switching device section and the diode section.
    Type: Grant
    Filed: September 14, 1994
    Date of Patent: November 10, 1998
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Michiaki Hiyoshi, Takashi Fujiwara, Hideo Matsuda, Satoshi Yanagisawa, Susumu Iesaka, Tatuo Harada