Patents by Inventor Chao-Hsin Chang

Chao-Hsin Chang 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: 5783097
    Abstract: A simple, non critical, low cost process step is added to the manufacture of integrated circuit wafers to remove a ridge of dielectric material remaining at the flat edge of the wafer after an edge rinse has removed the ridge of dielectric from the circular edges of the wafer. A layer of dielectric, such as Spin-On-Glass or the like, is formed on the wafer. An edge rinse is then used to remove the ridge of dielectric formed at the wafer edge, however the edge rinse does not remove the ridge of dielectric at the flat edge of the wafer. A layer of photoresist is formed on the wafer, selectively exposed, and developed to form a photoresist mask. The flat edge of the wafer is then dipped in buffered oxide etch to remove the dielectric material at the flat edge of the wafer. The photoresist mask is then stripped and processing of the wafer is continued.
    Type: Grant
    Filed: June 9, 1997
    Date of Patent: July 21, 1998
    Assignee: Taiwan Semiconductor Manufacturing Company, Ltd.
    Inventors: Chi-Shen Lo, Chao-Hsin Chang, Chia-Hsiang Chen, Hsien-Wen Chang, Chih-Heng Shen