1977-09-28
1978-12-19
Cooper, William C.
H04M 906
Patent
active
041307372
ABSTRACT:
A two-path intercom system wherein a first link or path is non-exclusive and the second link or path is exclusive. When the system is idle, the first call is automatically switched to the second link or path when the called party answers. While the first conversation is taking place on an exclusive basis, a subsequent call will be switched to the first link or path, on a non-exclusive basis. The subsequent call is automatically switched to the exclusive second link or path when said second link or path becomes idle. The system includes a conference feature whereby tone dialing phones may switch up to three stations to the second link for a private conference. An intercom code not assigned to a station is used to set up the conference. A conference on the first link may be established when the second link is busy; when the second link becomes idle, the conference is automatically switched to the second link. In the idle state all stations are connected internally to the first link or path. The first station to go off hook is switched over to the second link or path and is connected to a selector unit. When that station places a call, the called party is also switched to the second link or path upon answering. Until both parties go on hook, every other station and the selector unit are connected to the first link or path, which then acts as a single-link intercom system.
REFERENCES:
patent: 2883457 (1959-04-01), Carter et al.
patent: 3342944 (1967-09-01), Barbato et al.
patent: 4010332 (1977-03-01), Matheny
Cooper William C.
Melco
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