Appeal No. 2001-0526 Page 5
Application No. 08/960,236
identified by identifying the signals from the erasing or writing
pressure detector, and that the write and erase modes are
identified by the received pressure signal.
From our review of Verrier, we find that Verrier is directed
to a pen-based computer system including a stylus having a
contact detection mechanism and a radiative pickup position
detector on both ends of the stylus (col. 3, lines 9-11). The
first end of the stylus is used for writing data into the system.
The opposite end of the stylus is used for erasing data (col. 3,
lines 11-13). The stylus includes a mechanical contact detecting
branch 24 and a position detecting branch 26 (col. 5, lines 12-
16). A digitizing display includes an electrostatic tablet 54
which radiates electromagnetic radiation which is detected by the
first X-Y position sensing transducer in the stylus when it is
oriented proximate the tablet (col. 3, lines 32-36). The signals
radiated from conductors 56, 58 of the tablet 54 are detected by
antenna 29 of the position detecting branch 26 (col. 6, lines
5-8). Signal strength detector 32 receives X-Y position
information and Z separation from antenna 29 (col. 6, lines
51-53). As shown in figures 7A and 7B (See also col. 11,
lines 5-58), the calibration process for the embodiment of
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