Subscribers telephone hold circuit with automatic disconnect
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United States of America Patent
Stats
-
Jul 16, 1985
Grant Date -
N/A
app pub date -
Aug 25, 1983
filing date -
Aug 25, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A hold circuit for use with a single line telephone which may or may not be equipped with extension instruments. The circuitry in response to the momentary operation of a manual switch actuates a siliconcontrolled rectifier to place a resistive load across the telephone line thus allowing the subscriber at the basic telephone instrument to go 'on hook'. Subsequent removal of the basic instrument handset from the hookswitch or an extension phone going 'OFF HOOK' will cause the resistive load to be removed. Also included is a hold release circuit which automatically disconnects the hold circuit after a predetermined period of time.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
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