Electronic telephone call timer

Details Electronic telephone call timer Electronic telephone call timer

1977-03-03

1978-03-14

Claffy, Kathleen H.

179 2TC, 179 1HS, 58152T, H04M 121

Patent

active

040792013

ABSTRACT:
An electronic telephone call timing system for providing both individual and cumulative call timing for a dedicated telephone.
The device includes a call timer and display unit for generating a visible indication of the elapsed time of an individual call interval, a cumulative timer and display unit for generating a visible indication of the cumulative use time of the associated telephone, a power supply unit for generating a reference supply voltage, a gated clock signal train and a reference frequency signal from an AC line source, and a telephone off-hook sensor unit coupled to the power supply unit and the call timer and display unit for generating a gated reference frequency signal and a gated reset signal in response to the receiver being placed in an off-hook condition. The call timer and display unit includes circuitry responsive to the generation of the gated reset signal for initializing a counter contained therein.

REFERENCES:
patent: 3320366 (1967-05-01), Plummer
patent: 3512355 (1970-05-01), Lang
patent: 3538258 (1970-11-01), Zuckerman
patent: 3769463 (1973-10-01), Graham et al.
patent: 3801745 (1974-04-01), Zuckerman
patent: 3806652 (1974-04-01), Woolf et al.
patent: 3982073 (1976-09-01), Baltzer et al.

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