Appeal No. 2000-1944
Application 08/738,157
"[E]vidence of a suggestion, teaching, or motivation to combine
may flow from the prior art references themselves, the knowledge
of one of ordinary skill in the art, or, in some cases, from the
nature of the problem to be solved." Id. It is true that the
motivation need not be found expressly in the references;
however, if it is not in the references it must be found within
one of the two other sources, either the knowledge of one of
ordinary skill in the art or the nature of the problem.
We agree with Appellants that Froehling does not disclose or
suggest the need for any visible display other than the LED
display 59 of the operator panel 57, which permits the display
and adjustment of selected system operating parameters (col. 11,
lines 52-55). While Froehling mentions that data processing
units 16 perform information checking and verification (col. 10,
lines 51-52), there is no suggestion that there is a visible
display if the message is successfully processed or even that
units 16 are located where displays would be seen by an operator.
Froehling does not disclose that units 16 or controllers 10 send
an acknowledgment signal is response to successful processing of
a message that could be provided with a visible indicator. Thus,
the motivation to provide a visible display in response to a
message from the head end unit is not found in Froehling.
Dahl discloses a manual signaling system between a plurality
of operator stations 80, 81, having push buttons 82 and
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