Appeal No. 1997-3743
Application 08/419,166
observation at the top of page 6 of the brief that with respect
to the claimed invention on appeal, no interface is switched off
or bypassed, the examiner's reliance upon Nakayama is lessened.
Therefore, we consider this reference to be cumulative to the
teachings already indicated in Mathews.
Appellant's view of Mathews and his teachings is incomplete.
Moreover, appellant appears to attempt to persuade us of the
patentability of claim 9 on appeal based upon the numerous
features disclosed but unclaimed. Page 4 of the answer details
the examiner's view that the use of differential serial buses was
well known in the art even though the examiner and we recognize
that there is no explicit teaching of this feature in Mathews.
Appellant does not contest this observation of the examiner that
such a communication approach was well-known in the art and, in
fact, appellant's own disclosed invention of the interfacing
standard
RS-485, on which the claimed feature appears to be based, is
based upon a well-known industry standard. Differential
signaling is nothing more than the digital signal version of a
well-known balanced transmission line approach utilizing two
conductors such as a twisted pair to form a complete circuit,
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