Appeal No. 97-1171
Application 08/488,171
overvoltage relay instead of an overcurrent relay. Bereskin
uses a voltage sensor 42 connected across the neutral winding
22W of a core 36 (Figure 1) to sense a drop in voltage to
thereby trip circuit breaker 46 via mechanical actuator 44
(column 4, lines 31 through 42). Staad discloses a comparator
6 connected across the input and the output of power amplifier
2 (Figure 1). If the output voltage of the power amplifier
becomes smaller than the input voltage to the power amplifier,
“then the output voltage of the comparator 6 becomes positive,
the transistor T conducts, the relay A is actuated and the
rest contact a opens, so that the current supply to the corona
electrode 5 is interrupted” (column 3, lines 13 through 19).
In summary, the obviousness rejection of claims 1 through 11
is reversed because all of the claims on appeal require power
sensing and comparison, and the applied prior art neither
teaches nor would have suggested the sensing and comparison of
power readings.
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