Remote meter reading apparatus comprising interphone means

Details Remote meter reading apparatus comprising interphone means Remote meter reading apparatus comprising interphone means

1977-12-19

1979-04-24

Claffy, Kathleen H.

H04M 1100

Patent

active

041513711

ABSTRACT:
A utility meter in a dwelling or the like is read from a main station through a transmission line. A reverse current blocking diode is provided in the transmission line. Interphones for voice communication are connected to the transmission line at the meter and main station. A bias voltage source forward biases the diode to enable voice communication.

REFERENCES:
patent: 3266018 (1966-08-01), Higgins

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