Automatic telephone line sharing and lockout apparatus

Details Automatic telephone line sharing and lockout apparatus Automatic telephone line sharing and lockout apparatus

1987-09-10

1989-02-14

Brown, Thomas W.

Telephonic communications

Call or terminal access alarm or control

Lockout or double use signalling

379161, 379184, 379394, H04M 170, H04M 172

Patent

active

048052108

ABSTRACT:
Automatic telephone line sharing apparatus is disclosed that will only allow one telephone set or other communication device to be connected to a shared telephone line at a time. Circuits in the apparatus sense when a first one of a plurality of telephone sets or other communication devices is connected to a shared line and causes switches to be operated disconnecting the other telephone sets and devices from the line. When the first set or device disconnects from the shared line, this is sensed and the other sets or devices are automatically reconnected to the shared line. This automatic operation insures exclusive line use by blocking line access by other telephone sets or devices sharing the common telephone line.

REFERENCES:
patent: 4000375 (1976-12-01), Kawamura

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