Key telephone privacy circuit

Details Key telephone privacy circuit Key telephone privacy circuit

1973-12-26

1978-09-26

Claffy, Kathleen H.

179 17B, H04M 168

Patent

active

041172744

ABSTRACT:
A privacy circuit for use in a key telephone station set is disclosed. Using only a single relay, the privacy circuit operates to exclude the user from a busy central office line while allowing the user to gain access to an idle line. The privacy circuit is positive acting and cannot be circumvented by manipulating the keys and/or switchhook while at the same time allowing service to continue during a local power failure. Additional circuitry is provided to allow conference connections among key telephone sets equipped with privacy circuits.

REFERENCES:
patent: 3299217 (1967-01-01), Burns
patent: 3385935 (1968-05-01), Anderson et al.
patent: 3499121 (1970-03-01), McIntosh et al.
patent: 3514544 (1970-05-01), Chambers, Jr.
patent: 3725601 (1973-04-01), Jetzt et al.

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