Glazing unit alarm systems

Details Glazing unit alarm systems Glazing unit alarm systems

1986-01-02

1987-09-08

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

Specific condition

340590, 340598, 340652, 200 6108, 109 5, 109 21, 52782, 52788, 52791, 126419, 47 17, 4271263, G08B 1300

Patent

active

046927441

ABSTRACT:
A glazing unit alarm system includes a light transmitting electrically conductive coating which extends over at least most of the area of a glazing panel and forms part of an alarm circuit. Changes in the resistance of the coating, occasioned by breakage or attempted breakage of the glazing panel, trigger an alarm. The alarm system is characterized by the electrically conductive coating being constituted by an emissivity coating, e.g. a low-emissivity coating, for modifying the effect of incident electromagnetic radiation on the glazing panel over different wavelengths.

REFERENCES:
patent: 3825918 (1974-07-01), Laidlaw, Jr. et al.
patent: 3825919 (1974-07-01), Levin et al.
patent: 3947837 (1976-03-01), Bitterice
patent: 4598274 (1986-07-01), Holmes

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