Telephone call screening apparatus
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jul 18, 1989
Issued Date -
N/A
app pub date -
Jun 3, 1988
filing date -
Jun 8, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An apparatus to be connected in combination with a conventional telephone receiver and its circuit which prevents the telephone receiver from being activated (ringing) until a preselected code is supplied into the telephone circuit by the calling party.
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Cited Art Landscape
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