Intrusion detection and warning system
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Mar 9, 2004
Grant Date -
Jan 30, 2003
app pub date -
Mar 7, 2002
filing date -
Jul 25, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A warning system comprises a piezo-electric ceramic capable of resonating with an ultrasonic wave having a frequency within a predetermined frequency band and thus outputting an electric signal, a resonator capable of detecting only a signal component having a specific frequency from the electric signal output from the piezo-electric ceramic. When the resonator has detected a signal component having a specific frequency, an alarm signal is continuously generated for a predetermined time set by a timer, so that a warning notice is produced by an alarm device in accordance with the alarm signal.
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