Permanent connection public telephone appliance
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United States of America Patent
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-
May 15, 1990
Issued Date -
N/A
app pub date -
May 12, 1989
filing date -
Jun 24, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A permanent connection public telephone appliance is provided for connection to the switched network by a connection unit. It is permanently fed with power romotely by a source of the connection unit connected in parallel across the line of the appliance. The switched network is isolated from the source by capacitors. Line connection to the appliance is provided by a relay of the connection unit.
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