Telephone circuit to eliminate use of a hold button

Details Telephone circuit to eliminate use of a hold button Telephone circuit to eliminate use of a hold button

1975-10-10

1977-01-18

Claffy, Kathleen H.

179 1CN, H04M 172, H04M 356

Patent

active

040041077

ABSTRACT:
A circuit arrangement to enable one party to have a two-way conversation simultaneously with an outside party and an internal party. The circuit arrangement includes circuitry so that the outside party cannot hear anything that is said by the internal party or vice versa. Thus, the one party has the ability to talk to both the outside and the internal party without them hearing each other while using one subset and not putting anyone on hold. In addition, the circuitry includes a button which when depressed enables all three parties to be put into a two-way conference.

REFERENCES:
patent: 3423532 (1969-01-01), Coel et al.
patent: 3515807 (1970-06-01), Clark
patent: 3725601 (1973-03-01), Jetzt et al.
patent: 3819871 (1974-06-01), Verdon

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