Multiple digit dialing module

Details Multiple digit dialing module Multiple digit dialing module

1975-06-25

1976-11-16

Claffy, Kathleen H.

179 90D, 179 18DA, H04M 1700

Patent

active

039925889

ABSTRACT:
A circuit for providing coin-free dialing of a predetermined number of digits is provided for use with a telephone pay station. A signal generator to provide a pulse in response to each telephone number dialed is included. The signal generator is connected to a counter for providing an output signal after counting a predetermined number of pulses. A phantom coin circuit is connected to the counter and to the telephone central office for simulating the existence of a coin to the central office to cause the central office to accept the dialing signals. Another circuit is provided for prevention of fraudulent push-button chain-dialing. This fraud prevention circuit includes a timing circuit and a latch which effectively shunts the push-button dial if chain-dialing is attempted.

REFERENCES:
patent: 3406256 (1968-10-01), Stromben
patent: 3657481 (1972-04-01), DiMassimo
patent: 3702903 (1972-11-01), Barton
patent: 3757055 (1973-09-01), McCann et al.
patent: 3804984 (1974-04-01), Yachabach

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