Patents by Inventor Prochy Sethna

Prochy Sethna 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: 6383933
    Abstract: A planarization process in which an organic film prevents oxide dishing during the chemical mechanical polishing step. In the planarization process an organic film having high CMP selectivity to silicon dioxide is spun over silicon dioxide. A patterned mask is then placed over the organic film and the exposed portions of the organic film are etched away. The remaining portions of the organic film prevent oxide dishing during chemical mechanical polishing because the high CMP selectivity of the organic film to silicon dioxide stops the etching before oxide dishing occurs. The organic film may then be oxygen ashed off the planarized surface if so desired.
    Type: Grant
    Filed: March 23, 2000
    Date of Patent: May 7, 2002
    Assignee: National Semiconductor Corporation
    Inventors: Jen Shu, Michael E. Thomas, Prochy Sethna