Patents by Inventor Charles B. Dobson

Charles B. Dobson 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: 5320934
    Abstract: In a process for creating a mask on the surface of an integrated circuit workpiece, a first layer of resist is applied to the surface of the workpiece. An upper portion of this first layer is metallized. A second layer of photoresist is applied to the first layer. The second layer of photoresist is selectively exposed and developed. Using the developed second layer as a mask, exposed respective areas of the metallized upper portion of the first layer are etched, and the non-metallized portions of the first layer are subsequently etched. The result is a metallized mask on the surface of the workpiece that avoids the problems of high topographical relief and irradiation reflections from the workpiece surface.
    Type: Grant
    Filed: March 5, 1993
    Date of Patent: June 14, 1994
    Inventors: George R. Misium, Charles B. Dobson