Appeal No. 96-0671
Application 08/192,078
Instant claim 5 requires, inter alia, that the x-y position
of the stylus be computed “using a computation based on
differences between four pairs of distance signals.” As an
example, instant Figure 6 shows these four pairs as “A-C,” “B-
D,” “A-D” and “C-B.”
The reference to Asher clearly does not disclose the
claimed “four pairs of distance signals.” The examiner relies
on Figure 9 of Asher wherein voltage signals Vr, Vl, Vt, and Vb are
related to distance signals from each corner of the tablet.
However, these voltage signals are then paired up into two pairs
(Vr –V1 and Vt-Vb), rather than the claimed “four pairs.”
The examiner appears to indicate that the voltage signals
of Asher really do show “four pairs,” as claimed, because each
voltage signal represents the voltage between a certain point
and ground potential. As pointed out by appellants, such an
interpretation is improper because claim 5 also calls for the
suppression of “common-mode signals” and so ground potential
cannot be part of the claimed pairs of distance signals. But,
in any event, even if the four voltage signals of Asher are to
be so construed, the x-y position of the stylus in Asher is
still computed based on the differences between only two pairs
of signals through differential amplifiers 50 and 51, and not on
the “four pairs” required by instant claim 5.
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Last modified: November 3, 2007