Appeal No. 2001-1627
Application No. 09/289,420 Page 17
frequency is superimposed on the rectified output
voltage of the bridge rectifying circuit D1, as shown
in FIG. 2C.
From the disclosure of Yasumura that the positive terminal
is the output of the rectifying bridge D1; the showing of Ei in
figure 2C having positive polarity, and the positive polarity
shown in figure 1 at the input to the switching power circuit 1,
we find that the input and output voltages of figure 1 of
Yasumura are of the same polarity, as recited in claim 1.
It is further argued (reply brief, pages 5) that Yasumura
does not meet the claimed limitation that "the primary and
secondary circuit loops are not electrically isolated." From our
agreement with appellant, supra, that a capacitor will tend to
isolate, we agree with appellants (id.) that the capacitor C2
does not eliminate the isolation of the primary and secondary
circuit loops. However, because the output of the switching
voltage transferred to the secondary winding is superimposed on
the rectified output voltage on the rectified path, we find that
notwithstanding the presence of switching transistors Q1 and Q2,
that there is no clear teaching in Yasumura of the primary and
secondary circuits not being isolated, because Yasumura does not
disclose current flow between secondary winding Ni and switching
transistors Q1 and Q2. To find that Yasumura discloses non-
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