Appeal No. 96-1386
Application 08/030,937
not teach or suggest a two-way dispatch radio communication unit
having a microphone and a control means for controlling operation
of the radio transceiver means in at least a first and second
discrete mode, wherein in the first discrete mode, the radio
transceiver means transmits audio messages and in the second
mode, the radio transceiver means transmits the video information
and the push-to-talk switch means for selecting the first and
second discrete modes of operation as recited in Appellants
claims. Brown teaches to those skilled in the art how to modify
a typical two-way dispatch radio communication unit to become a
dedicated two-way dispatch radio communication unit that only has
one mode in which video information is transmitted. See columns
1 and 2. Brown does not teach a modification in which typical
two-way dispatch radio communication retains its original
function of having a discrete mode for transmitting audible
messages. We agree that Brown does mention a push-to-talk switch
of a typical two-way dispatch radio in column 5, lines 52 and 53.
However, in column 5, lines 35-68, Brown teaches that the push-
to-talk switch is modified so that the PIA 34 keys the
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