Line circuit for use with a key telephone system

Details Line circuit for use with a key telephone system Line circuit for use with a key telephone system

1975-06-25

1977-01-18

Claffy, Kathleen H.

179 84L, H04M 100

Patent

active

040041069

ABSTRACT:
There is provided a line circuit for connection to a key telephone system for indicating an incoming call, a call placed on hold, and an answered call. There is further provided a means for automatically indicating that the incoming call has been placed on hold for a predetermined time period. There is further provided a solid state device which switches telephone instrument lamp current for visual indication of the various line circuit operations.

REFERENCES:
patent: 3629514 (1971-12-01), Flamini, Jr.
patent: 3742151 (1973-06-01), Ruether
patent: 3806665 (1974-04-01), Goldberg
patent: 3909554 (1975-09-01), Reed
patent: 3914559 (1975-10-01), Knollman

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