Appeal No. 95-3913
Application 07/910,219
The invention relates to a 1 x N communication system having
N telephones which are the usual telephone handsets with an
additional press-talk push-button. The press-talk push-button
functions as a contact switch that allows the user to make an
announcement to the other N-1 handsets. Appellants disclose on
page 10 of the specification that Figure 2 shows one embodiment
of Appellants' 1 x N communication system having N telephone
handsets 4 having a press-talk push-button 9, a time division
switching system 10, a press-talk trunk 30 and a central
controller 12. Appellants disclose on pages 10-13 of the
specification that the press-talk trunk 30 receives a signal when
the press-talk push-button 9 is depressed. The press-talk trunk
30 then generates a notification signal and transmits this signal
to the controller 12. The controller 12 controls the time
division switching system 10 to send voice signals from the
telephone handset to all the other telephone handsets.
The independent claim 1 is reproduced as follows:
1. A 1 x N communication system, where N is an integer
greater than two, comprising:
at least three terminals for sending and receiving
voice signals, having respective press-talk
switches for generating press-talk signals with
active and inactive states;
a time division switching system coupled
separately to each of said terminals, for
2
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