Patents by Inventor Robert I. Chen

Robert I. Chen 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).

  • Bilateral phototransistor
    Patent number: 4212023
    Abstract: A bilateral optically coupled phototransistor includes an infrared emitting diode coupled with a light sensitive transistor. The transistor includes symmetrical interdigitated emitter and collector regions separated by a light sensitive base. Diffused, epitaxial and thermal gradient migration structures are described. Applications are illustrated for variable resistor and analog switch modes of operation.
    Type: Grant
    Filed: November 30, 1978
    Date of Patent: July 8, 1980
    Assignee: General Electric Company
    Inventors: Hing C. Chu, William H. Sahm, III, Robert I. Chen