Patents by Inventor Hing C. Chu

Hing C. Chu 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).

  • Control of valley current in a unijunction transistor by electron irradiation
    Patent number: 4292644
    Abstract: An improved unijunction transistor having increased valley current is characterized by a region of locally lower lifetime proximate the emitter-base junction. The lifetime is reduced either by overall irradiation of the device or, more preferably, by selective irradiation of the junction area alone.
    Type: Grant
    Filed: April 2, 1979
    Date of Patent: September 29, 1981
    Assignee: General Electric Company
    Inventors: Hing C. Chu, Y. S. Edmund Sun
  • Control of valley current in a unijunction transistor by electron irradiation
    Patent number: 4230791
    Abstract: An improved unijunction transistor having increased valley current is characterized by a region of locally lower lifetime proximate the emitter-base junction. The lifetime is reduced either by overall irradiation of the device or, more preferably, by selective irradiation of the junction area alone.
    Type: Grant
    Filed: April 2, 1979
    Date of Patent: October 28, 1980
    Assignee: General Electric Company
    Inventors: Hing C. Chu, Y. S. Edmund Sun
  • 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