Patents by Inventor Kathryn Helen Kelleher

Kathryn Helen Kelleher 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: 6069081
    Abstract: A method of planarizing a dielectric coating applied over an underlying structure on an integrated circuit wafer employs a two-step chemical mechanical polishing (CMP) process. The underlying structure is characterized as having elevated areas and recessed areas. The wafer can be prepared by applying a first polish stop on the elevated areas, then depositing a layer of dielectric over at least the recessed areas, and finally depositing a second polish stop over the resulting dielectric coating. In some applications a first polish stop is not required. The first step in the two-step CMP is polishing the second polish stop using a slurry that polishes the second polish stop until the second polish stop is substantially removed over the elevated areas. The second step is polishing the dielectric coating that remains using a second slurry that polishes the dielectric at a faster rate than it polishes either the second or first polish stop.
    Type: Grant
    Filed: April 28, 1995
    Date of Patent: May 30, 2000
    Assignees: International Buiness Machines Corporation, Siemens Components, Inc., Kabushiki Kaisha Toshiba
    Inventors: Kathryn Helen Kelleher, Matthias Peschke, Hiroyuki Yano