Patents by Inventor Da-Chi Kuo

Da-Chi Kuo 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).

  • Patent number: 5646431
    Abstract: A metal oxide semiconductor field effect transistor with a lightly doped silicon substrate includes an oppositely doped well and oppositely doped source region and oppositely doped drain region with respect to the lightly doped substrate, the improvement comprising at least one counter doped region formed along the surface of the oppositely doped well between the source and drain regions. The substrate comprises a P-substrate, the well comprises an N- well and the counter doped region is doped P; the counterdoped region comprises an island among a plurality of islands between the source region and the drain region. The counterdoped region comprises an island among a plurality of islands between the source region and the drain region.
    Type: Grant
    Filed: February 28, 1996
    Date of Patent: July 8, 1997
    Assignee: United Microelectronics Corporation
    Inventors: Ching-Hsiang Hsu, Da-Chi Kuo