Appeal No. 20000-0717
Application 08/906,676
to place a low pass filter after phase comparator 32 of Rogers
to remove noise and to place a frequency divider before the
tracking filter of Rogers to reduce the frequency of the input
signal to a predetermined frequency matched to the operating
frequency of the tunable band pass filter 30.
Appellant does not deny that low pass filters for
removing noise and frequency dividers for reducing the
frequency of signals were known and we agree that such
elements were known at the time of the instant invention.
However, merely because such elements and their functions were
known would not have provided a suggestion to skilled artisans
to have provided these elements in the specific combination of
elements claimed by appellant.
The examiner asserts the use of these elements to be “a
matter of a design expedient for an engineer dependent upon a
particular environment and the applications in which the
tracking filter circuit of Roger [sic, Rogers], Jr. is to be
used” [answer-page 5].
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Last modified: November 3, 2007