Telephone line overvoltage protection apparatus
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Oct 25, 1994
Issued Date -
N/A
app pub date -
Jun 9, 1993
filing date -
Jun 8, 1992
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An overvoltage protection apparatus used with a pair of telephone lines includes first voltage clamping circuitry for clamping voltage signals on the lines at a first predetermined voltage potential. The first voltage clamping circuitry is formed by at least a pair of solid-state protective chip devices and a failure mode mechanism adapted for connecting the lines to ground responsive to increased temperature of the solid-state protective chip device and providing a ground connection for the pair of solid-state protective chip devices. A pair of current limiting resistors operatively connected to the failure mode mechanism provide sneak current protection.
First Claim
Other Claims data not available