Patents by Inventor William Uei-Chung Liu

William Uei-Chung Liu 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).

  • Microwave heterojunction bipolar transistors with emitters designed for high power applications and method for fabricating same
    Patent number: 6025615
    Abstract: In one form of the invention, an emitter structure for a bipolar transistor is disclosed. The structure is comprised of an emitter layer 6 of Al.sub.x Ga.sub.1-x As, where x>0.4, abutting a base layer 8.
    Type: Grant
    Filed: December 23, 1994
    Date of Patent: February 15, 2000
    Assignee: Texas Instruments Incorporated
    Inventors: William Uei-Chung Liu, Darrell Glenn Hill
  • Thermally uniform transistor
    Patent number: 5850099
    Abstract: Generally, and in one form of the invention, a method for fabricating a transistor having a plurality of active regions comprising spacing or shaping the emitters 20 and 22, or gates, in a non-uniform manner to provide a substantially constant temperature over an active region of the transistor is disclosed. An advantage of the invention is that the occurrence of a thermal runaway condition between transistor current and temperature is generally avoided.
    Type: Grant
    Filed: November 12, 1993
    Date of Patent: December 15, 1998
    Assignee: Texas Instruments Incorporated
    Inventor: William Uei-Chung Liu