Communications – electrical: acoustic wave systems and devices – Receiver circuitry – Responsive to intruder energy
Patent
1985-09-03
1987-04-28
Farley, Richard A.
Communications, electrical: acoustic wave systems and devices
Receiver circuitry
Responsive to intruder energy
340566, G08B 1300
Patent
active
046619399
ABSTRACT:
In combination, intrusion detection apparatus giving a signal when a light vehicle approaches a geophone, and a heavy vehicle discriminator disabling the detection apparatus when the approaching vehicle is a heavy one.
REFERENCES:
patent: 3585581 (1971-06-01), Aune et al.
patent: 3745552 (1973-07-01), Wilt
patent: 3780653 (1973-12-01), Stinchcomb
patent: 4158832 (1979-06-01), Barnes, Jr. et al.
patent: 4468763 (1984-08-01), Braunling et al.
Farley Richard A.
Honeywell Inc.
Jensen Roger W.
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