Appeal No. 1998-1100
Application No. 08/720,645
OPINION
The obviousness rejection of claims 20 through 25 is
reversed.
All of the claims on appeal are directed to a capacitor
for a DRAM cell that has a storage electrode with a solid
hemispherically-shaped upper portion.
Ahn discloses a capacitor for a DRAM cell (Figures 1, 3B,
4C and 4D) that has a storage electrode with a square-shaped
upper portion 100. A cavity is formed in the upper portion
100.
According to the examiner (Answer, pages 4 and 5),
Suganaga discloses a hemispherically-shaped electrode. In
view of the lack of any specifics, we assume the examiner is
referring to the hemispherically-shaped portion 4 (Figures 1
and 10 through 13). In view of these teachings, the examiner
concludes (Answer, pages 4 and 5) that it would have been
obvious to one of ordinary skill in the art to substitute
Suganaga’s hemispherically-shaped electrode for the square-
shaped upper portion 100 in Ahn because they are both
functionally equivalent electrode shapes.
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