Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1986-05-16
1988-09-20
Crosland, Donnie L.
Communications: electrical
Condition responsive indicating system
With particular system function
340506, 340508, 340551, 340565, 180167, 901 1, 356399, 342 27, 367 93, 358108, G08B 1900
Patent
active
047728752
ABSTRACT:
An intrusion detector has a first sensor for monitoring a first condition and a second sensor for monitoring a second condition in a space to be protected against intrusion; a change in the condition sensed by the first sensor in a target area causes the second sensor to be aligned with the same target area; and if both sensors indicate a change in the respective conditions that they monitor an intrusion is indicated.
REFERENCES:
patent: 4087814 (1978-05-01), Spirig
patent: 4437089 (1984-03-01), Achard
patent: 4710020 (1987-12-01), Maddox et al.
George, II Robert W.
Kadonoff Mark B.
Maddox James F.
Wendt Roger A.
Crosland Donnie L.
Denning Mobile Robotics, Inc.
Denninger Douglas E.
Iandiorio Joseph S.
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