Discriminating means for telephone circuits
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United States of America Patent
Stats
-
Jul 15, 1980
Grant Date -
N/A
app pub date -
Nov 3, 1978
filing date -
Nov 3, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An electronic circuit for use with telephone instruments or the like in those cases where so-called 'dial tap' is encountered, whereby a buzzer or bell included as part of the telephone instrument is adversely affected when the dial is rotated for purposes of dialing a particular call number. The circuit provides a discriminating function against the short term dial pulses by blocking them, but allows ringing current to pass substantially unaffected.
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Family
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Cited Art Landscape
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