Telephone system providing a talking operation after main power supply failure
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United States of America Patent
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-
Sep 28, 1999
Grant Date -
N/A
app pub date -
Mar 6, 1997
filing date -
Nov 29, 1996
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
When an SP key is operated when power from a commercial utility is disconnected, an energized state forming circuit forms an energized state from a subscriber's line and power is supplied from the subscriber's power supply section through the energized state forming circuit to a microcomputer. The microcomputer thus is operated from the subscriber's line even after power failure occurs.
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Family
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