Appeal No. 97-2630
Application 08/186,050
control rectifier senses when a voltage difference between two
of the power distribution networks exceed a predefined limit,
and forms a conductive path between the two networks when the
predefined limit is reached, as is recited in claim 13.
While it may be true that one with ordinary skill in the
art would consider standard and well known design guidelines
when integrating digital and analog circuits on a chip, the
examiner has provided no factual evidence to establish that
after such consideration one with ordinary skill in the art
would have arrived at the appellant’s claimed invention. The
record does not establish either (1) that it was well known to
use one power distribution network for buffers, one for analog
circuitry, and one for digital control circuitry, or (2) that
it was well known to use silicon control recitifiers to
connect these power distribution networks such that each
silicon control rectifier can sense when a voltage difference
between two networks exceeds a predetermined limit and then
form a conductive path when the predefined limit is reached.
The examiner has failed to establish a prima facie case that
the claimed invention would have been obvious to one with
ordinary skill in the art in light of Duschatko and that
13
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