Telephone accessory
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Mar 5, 1991
Grant Date -
N/A
app pub date -
Aug 28, 1989
filing date -
Aug 28, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An apparatus for use with a telephone including, in one embodiment, a detector for detecting when the telephone is in an off-hook condition and disconnect circuit for eliminating the off-hook condition when the off-hook condition is caused by the telephone so that phone calls may be received by the line. An alarm responsive to the detector produces a warning of the off-hook condition if another phone on the line is off hook.
First Claim
Family
International Classification(s)
Cited Art Landscape
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