Appeal No. 2001-2019
Application No. 08/996,567 Page 9
opened, K8 will be de-energized and contacts K8A and K8B to
return to their original positions shown in figure 6, and the
flashing lights 310 will turn off. Thus, switch 320 can be
thought of as "flashing light-only" switch (col. 18, lines
29-39). Berry, III further disclose that in the event switch 320
has been closed and an alarm condition has been indicated by a
reversal of the voltage on terminals E and F of control panel 10,
or alternatively, a verbal message is initiated by depressing
master microphone button 162, the appearance of positive voltage
on the coils of relays K1 and K6 will forward bias diode 326,
causing transistor 322 to cease conduction, de-energizing the
coil of relay K8, and causing the contacts K8A and K8B to assume
the position shown in figure 6, wherein the alarm units 308 will
be supplied with audio, (either a siren-type signal or speech) on
transmission line 304, 306. The audio signal in turn will be
coupled through capacitors 316 and fed to speakers 312. In
addition, the audio will be rectified by rectifiers 332, 334,
336, and 338 of the bridge, filtered by capacitors 314, and
applied to the flashing lights 310. Thus, a combined audio and
visual alarm mode will ensue (col. 18, lines 40-57). Further
control over the visual/audible alarm mode is provided by switch
330 that is connected to transformer tap 328 in figure 2. If the
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Last modified: November 3, 2007