Portable intrusion alarm

Details Portable intrusion alarm Portable intrusion alarm

1988-07-20

1989-08-01

Orsino, Joseph A.

Communications: electrical

Condition responsive indicating system

Specific condition

340550, 340566, 340545, G08B 1320

Patent

active

048536776

ABSTRACT:
An intrusion alarm system, for an enclosed space responsive to frequencies in the one to two Hertz range for detecting opening of doors or windows; and responsive to frequencies in the three to four Khz range for detecting breaking glass. A detected frequency in the one to two Hertz range increases the sensitivity required for detecting breaking glass.

REFERENCES:
patent: 3543261 (1970-11-01), Burney
patent: 4134109 (1979-01-01), McCormick
patent: 4206451 (1980-06-01), Kurschner
patent: 4307387 (1981-12-01), Baxendale
patent: 4386343 (1983-05-01), Shiveley
patent: 4668941 (1987-05-01), Davenport

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