Appeal No. 96-2661
Application 08/177,975
second control circuit is adjusted to effect the required S-
shaping over the complete range of frequencies to be expected
to enable continuous S-shape correction irrespective of
changes in frequency. For support, the Examiner points to
column 8, lines 50 and 51, and lines 64 through 66).
The Examiner acknowledges that Teuling is silent as
to the frequency range. However, the Examiner points to the
admitted prior art on page 21 of the Appellants' specification
which teach that it is conventional for a display device to
operate in this range of frequencies. The Examiner argues
that it would have been obvious to one having ordinary skill
in the art to modify Teuling by using the conventional range
in which the minimum frequency is 30 kHz and the maximum
frequency is 60 kHz. The Examiner argues that the reason
for using this frequency range would have been the
conventionality of such a range as admitted by
Appellants' specification. The Examiner furthermore argues
that since the S-distortion in the linearity is corrected
and since the current flowing through the S-capacitor is
proportional to some power of the horizontal frequency, the
8
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