Appeal No. 2002-1318
Application No. 08/693,662
that the signal is stray propagation from a power line, as
advanced by appellants (brief, page 5).
From the disclosure of Dockery, we find that in a first
embodiment, video and audio signals are transmitted across an
existing home power line with a transmitter, and that the signal
is tapped from the power line using a receiver (col. 2, lines 29-
34). In addition, the transmitted video signal is broadcast from
the power line, using the power line as an aerial antenna, to
approximately 200 feet from all points on the power line (col. 3,
lines 3-6). In the second embodiment, the signal may be
broadcast from existing home wiring and may be multiplied for a
plurality of receivers for a plurality of power outlets available
in the home power line by aerially receiving the video and audio
signals at the any number of receivers (col. 2, line 64 through
col. 3, line 16). Dockery further discloses (col. 11,
lines 13-32) that the receiver may be used to pick up broadcast
television, without the assistance of the transmitter. In the
arrangement of figure 5, the VCR 34 and transmitter 10 may be
detached from power line 50. This isolates the television
receivers 40A-40C from the VCR 34. To receive a television
broadcast channel, the user sets the television to the desired
channel and adjusts switches 101-106 in switching circuit 92 to
8
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