Intrusion or movement detector
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jul 29, 1980
Grant Date -
N/A
app pub date -
Jan 18, 1978
filing date -
Jan 19, 1977
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An intrusion or movement detector including an oscillator for generating a radio signal, an antenna for transmitting said radio signal into an area to be surveyed by said detector, said antenna exhibiting a variable radiation resistance relative to the position and movement of objects in the area to be surveyed resulting in a variable loading on said generator when in use, a monitor for monitoring said variable loading and activating a signal or alarm when said variations in loading reach a predetermined threshold level to indicate an intrusion or movement in the area surveyed.
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Cited Art Landscape
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