Patents by Inventor Yoh Ogawa

Yoh 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).

  • Optical function semiconductor device
    Patent number: 4521681
    Abstract: An optical function semiconductor device formed by opto-electrical loop coupling of a light emitting diode and a photodetector, the latter of which receives a part of an output light of the former controlled by an output current thereof, can be readily miniaturized and integrated as a fundamental function active device self-containing a light source and presenting various useful novel functions of the optoelectronic technology between the external input and the output lights.
    Type: Grant
    Filed: May 24, 1982
    Date of Patent: June 4, 1985
    Assignee: Tohoku University
    Inventors: Humio Inaba, Hiromasa Ito, Yoh Ogawa
  • Laser functional device
    Patent number: 4483004
    Abstract: A laser functional device formed by photoelectric direct loop coupling of a laser diode and a photodetector, the latter of which receives a part of an output light of the former together with an external input light and excites the former by an output current thereof, can be easily miniaturized and integrated as a fundamental function active device self-containing a light source and presenting various useful functions of the optoelectronic technology between the external input and the output lights.
    Type: Grant
    Filed: March 25, 1982
    Date of Patent: November 13, 1984
    Assignee: Tohoku University
    Inventors: Humio Inaba, Hiromasa Ito, Yoh Ogawa