Patents by Inventor Pin-To Yao

Pin-To Yao 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).

  • Method of forming floating gate of memory device
    Patent number: 6812120
    Abstract: A method of forming a floating gate of a memory cell is provided. A substrate having at least a trench is provided. Next, a tunnel oxide layer is formed on a surface of the trench. Next, a conductive layer is filled in the trench. Next, two-step etching process is carried out to form a first floating gate and a second floating gate having a top corner with sharp edge over the sidewalls of the trench.
    Type: Grant
    Filed: February 26, 2004
    Date of Patent: November 2, 2004
    Assignee: Powerchip Semiconductor Corp.
    Inventors: Rex Young, Pin-Yao Wang