Appeal No. 96-1977
Application No. 08/348,389
digital sample values.” Logic analyzers of the prior
art all make threshold comparisons directly from the
input analog signal, and do not perform multi-bit A/D
conversion to obtain a series of multi-bit digital
sample values before making such a comparison.
We agree with appellants that two different devices (i.e.,
oscilloscopes and logic analyzers) are described on pages 1
through 8 of the Background of the Invention, and that neither
device is capable of performing all of the steps set forth in
claim 1. The last page of the Background of the Invention
indicates that “[s]everal efforts have been made to combine some
of the features of logic analyzers with those of oscilloscopes.”
Several broad features of combined devices are described on the
last page of the Background of the Invention, but they do not
perform the steps set forth in claim 1. In the absence of
evidence that states otherwise, we have no reason to disagree
with appellants’ argument (Brief, page 4) that “[i]n these
instruments there is a separation between the logic analyzer part
and the oscilloscope part, . . . .”
With respect to claim 30, we agree with appellants’ argument
(Brief, page 5) that “[t]he admitted prior art does not show the
combination of ‘displaying an analog waveform representation of
an input signal’, ‘supplying the user with a cursor positionable
along the time axis of the analog waveform display, the cursor
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