Automatic telephone call computer and display

Details Automatic telephone call computer and display Automatic telephone call computer and display

1976-12-10

1978-05-23

Claffy, Kathleen H.

H04M 1512

Patent

active

040912388

ABSTRACT:
Equipment for calculating and displaying the cost of a telephone call while it is in progress is disclosed which includes circuitry for defining the relative location of the caller and the person being called, determining the initial and overtime intervals for such call and determining the rate structure for such call.

REFERENCES:
patent: 3573378 (1971-04-01), Leyburn et al.
patent: 3590161 (1971-06-01), Jacobs
patent: 3769463 (1973-10-01), Graham et al.
patent: 3934240 (1976-01-01), Norling
patent: 3982073 (1976-09-01), Baltzer et al.

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