Patents by Inventor James T. Richmond, Jr.

James T. Richmond, Jr. 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).

  • Optically triggered wide bandgap bipolar power switching devices and circuits
    Patent number: 7679223
    Abstract: An electronic circuit includes a primary wide bandgap bipolar power switching device configured to supply a load current in response to a control signal applied to a control terminal thereof, and a driver device configured to generate the control signal. At least one of the primary switching device or the driver device may include an optically triggered switching device. A discrete wide bandgap semiconductor device includes a primary bipolar device stage configured to switch between a conducting state and a nonconducting state upon application of a control current, and a bipolar driver stage configured to generate the control current and to supply the control current to the primary bipolar device stage. At least one of the primary bipolar device stage and the bipolar driver stage may include an optically triggered wide bandgap switching device.
    Type: Grant
    Filed: April 27, 2006
    Date of Patent: March 16, 2010
    Assignee: Cree, Inc.
    Inventors: Anant K. Agarwal, Sumithra Krishnaswami, James T. Richmond, Jr.