Portable intrusion alarm

Details Portable intrusion alarm Portable intrusion alarm

1990-07-18

1992-04-28

Ng, Jin F.

Communications: electrical

Condition responsive indicating system

Specific condition

340522, 340566, G08B 1320

Patent

active

051092166

ABSTRACT:
An intrusion alarm system, for an enclosed space responsive to first frequencies in the one to two Hertz range for detecting opening of doors or windows; and responsive to second frequencies in the third to four Khz range for detecting breaking glass. A mode selector renders the alarm responsive to a selected one of either the first or the second frequencies, or the concomitant detection of both first and second frequencies.

REFERENCES:
patent: 3543261 (1970-11-01), Burney
patent: 4195286 (1980-03-01), Galvin
patent: 4209776 (1980-06-01), Frederick
patent: 4437089 (1984-03-01), Achard
patent: 4668941 (1987-05-01), Davenport et al.
patent: 4853677 (1989-08-01), Yarbrough et al.

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