Patents by Inventor Takuzo Ogawa

Takuzo Ogawa 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).

  • Light-activated semiconductor-controlled rectifier
    Patent number: 3943550
    Abstract: A light-activated semiconductor-controlled rectifier device comprising four layers of PNPN is disclosed in which a part of the edges of the PN junction formed between the intermediate P-type layer and the intermediate N-type layer is exposed on the same side on which the outer P-type layer is exposed, so that a photo-trigger signal is radiated on that exposed part of the edges of the PN junction.
    Type: Grant
    Filed: December 19, 1974
    Date of Patent: March 9, 1976
    Assignee: Hitachi, Ltd.
    Inventors: Nobutake Konishi, Tsutomu Yatsuo, Tatsuya Kamei, Masahiro Okamura, Takuzo Ogawa