Bhagavatula Claim 9
A telephone dialing apparatus for transmitting dialing signals over a communication path connecting
a telephone to a switching office, the apparatus comprising:
a telephone dialing circuit having
a plurality of first inputs,
plurality of second inputs and
an output,
connections between one of said first inputs and one of said second inputs
generating a dual-tone-multi-frequency (DTMF) telephone dialing signal;
a numeric keypad directly connected to said telephone dialing circuit;
an alphabetic keyboard device directly connected to said telephone dialing circuit;
said numeric keypad having numeric keys each of which connect one of said first inputs
and one of said second inputs together at said telephone dialing circuit to generate the
dialing signal at the output of said telephone dialing circuit;
said alphabetic keyboard device having a plurality of switch contacts each corresponding
to a single letter of the alphabet assigned to an alphabetic key, whic h
switch
contact
s
connect
one of
s a i d
f i r s t
inputs
and one
of said
second
inputs
together
at said
telepho
n e
dialing
circuit
t o
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Last modified: November 3, 2007