Key telephone exclusion circuit

Details Key telephone exclusion circuit Key telephone exclusion circuit

1979-07-26

1981-05-05

Brigance, Gerald L.

179 17B, 179 38, H04M 170

Patent

active

042661030

ABSTRACT:
An exclusion circuit for use in a key telephone providing an exclusion release feature. Key telephones are excluded or prevented from accessing a busy line by the exclusion circuit. The exclusion release feature, in a key telephone connected to a telephone line, is operated in response to operation of an exclusion release key or partial operation of a hold key, to allow an associated excluded key telephone to connect to a busy telephone line.

REFERENCES:
patent: 3725601 (1973-04-01), Setzt et al.
patent: 3909552 (1975-09-01), Kerman et al.
patent: 3941943 (1976-03-01), Matheny
patent: 4053720 (1977-10-01), Wycheck et al.
patent: 4075434 (1978-02-01), Merritt, Jr.
patent: 4081624 (1978-03-01), Kerman et al.
patent: 4117274 (1978-09-01), Cannon et al.
patent: 4158111 (1979-06-01), Saxon

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