Patents by Inventor Ritsuo Hama

Ritsuo Hama 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).

  • Thermally improved photodetector having a roughened, recessed, raised or inclined light receiving surface
    Patent number: 4697074
    Abstract: A photodetector comprising a photocell assembly including a substrate and at least one photocell formed on the substrate and having a light receiving face. The photocell assembly is completely embedded in a transparent resin molded body which has a light receiving surface defined therein so as to permit an incoming light incident thereupon to travel direct to the light receiving face of the photocell. The light receiving surface is roughened, recessed, raised, or inclined.
    Type: Grant
    Filed: December 11, 1985
    Date of Patent: September 29, 1987
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Kazuo Ito, Toshiyuki Kudo, Ritsuo Hama