Telephone toll restrictor

Details Telephone toll restrictor Telephone toll restrictor

1977-08-31

1978-11-07

Claffy, Kathleen H.

179189D, 179 18DA, H04M 166

Patent

active

041247817

ABSTRACT:
An improved telephone toll restrictor utilizing both current and voltage sensors having substantially infinite input impedance during the on-hook condition. A timing circuit is provided to restrict calls a predetermined time after a digit is dialed but prior to central office timeout. Furthermore, a pulse generator provides a strobe pulse to a coincidence gate which also responds to a digit pulse counter, for avoiding restriction of a digit which should not be restricted.

REFERENCES:
patent: 3727007 (1973-04-01), Catlin
patent: 3749847 (1973-07-01), Piacente et al.
patent: 3851109 (1974-11-01), Downs et al.
patent: 3872260 (1975-03-01), Oatis
patent: 3899640 (1975-08-01), Piacente
patent: 3980836 (1976-09-01), Chan et al.
patent: 4012602 (1977-03-01), Jackson

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