Patents by Inventor Roy Hiroshi Nakahara

Roy Hiroshi Nakahara 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).

  • Drive circuit with constant current output
    Patent number: 4047049
    Abstract: A constant current drive circuit that can be driven directly from the output of a shift register which can find use, for example, as a constant current source for a light emitting diode (LED) to ensure uniform birghtness throughout a display surface that includes a plurality of LEDs.
    Type: Grant
    Filed: October 28, 1975
    Date of Patent: September 6, 1977
    Assignee: Litton Systems, Inc.
    Inventors: Fred William Erickson, Roy Hiroshi Nakahara