DEVICE LIMITING TELEPHONE CONVERSATION TIME Russian patent published in 1999 - IPC

Abstract RU 2124816 C1

FIELD: telephone communication, systems of telephone communication with pulse dialing. SUBSTANCE: given device includes analyzer, timer, noise signal former sending noise signal into wires of line when subscriber exceeds specified time of conversation. Time limiting of conversation takes place only with outgoing communication. Technical result of invention consists in usage of line voltage to feed all units of device without employment of additional commutating elements. EFFECT: usage of line voltage to feed all units of device. 5 cl, 4 dwg

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RU 2 124 816 C1

Authors

Spiridonov A.E.

Gavrilkina G.N.

Dates

1999-01-10—Published

1998-02-06—Filed