Appeal No. 1997-3098
Application 08/377,776
plurality of second drive pulses, wherein the second drive
pulses are 180E out of phase with the first drive pulses and
the first and second drive pulses are sequentially provided to
both the filter probe and the fresh water probe, as well as to
a resistor circuit, to create a plurality of probe test
signals and a plurality of threshold test signals.
The examiner argues that Tucci ‘598 suggests out-of-phase
pulses and that it would have been obvious to one of ordinary
skill in the art to use such out-of-phase pulses in Birdsong’s
system to obviate problems relating to electrode contamination
and erosion (answer, page 4).
The portion of Tucci ‘598 relied upon by the examiner
teaches that the output from comparator 39 is an AC signal
which initially is in phase with the AC input applied to
middle electrode probe 27, but changes to be 180E out of phase
with the AC input to probe 27 when the resin bed becomes
exhausted between probe 25 and probe 27 (col. 5, lines 10-16).
Appellant argues that this teaching in Tucci ‘598 is not
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