Patents by Inventor Richard G. Matsui

Richard G. Matsui 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).

  • Lighting device having a circuit including a plurality of light emitting diodes, and methods of controlling and calibrating lighting devices
    Patent number: 7375476
    Abstract: A lighting device (132) includes a circuit having a power supply and a plurality of light emitting diodes (120) connected in series with the power supply. The plurality of light emitting diodes (120) includes at least two groups of series-connected light emitting diodes, the groups of series-connected light emitting diodes being connected in series. A different optically isolated field effect transistor (U3-U5) is connected in parallel with each group of series-connected light emitting diodes, for selectively shunting around the group of series-connected light emitting diodes. A different capacitor (C8-C10) can also be connected in parallel with each group of series-connected light emitting diodes. A controller (U2) is connected to a gate of each of the optically isolated field effect transistors (U3-U5) for selectively turning the optically isolated field effect transistors (U3-U5) on and off.
    Type: Grant
    Filed: April 8, 2005
    Date of Patent: May 20, 2008
    Assignee: S.C. Johnson & Son, Inc.
    Inventors: Scott D. Walter, Robert E. Corbett, Richard G. Matsui, Ben A. Beer