Screen for burglar alarms and method of making the same

Details Screen for burglar alarms and method of making the same Screen for burglar alarms and method of making the same

1989-07-19

1991-03-12

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340547, G08B 1302, G08B 1308

Patent

active

049996088

ABSTRACT:
An electrically conductive security screen includes an electrical resistance sensor and alarm to detect tampering with the screening material of a window. An elongated path of flexible and electrically conductive coating composition is applied to the screening material in a predetermined and non-overlapping pattern, such that a closed circuit loop is formed when it is attached to the sensor alarm; the coating having an electrical resistance that varies when it is distorted or its path interrupted. The pattern having a marginal section of high electrical resistance and being in series with at least one switch.

REFERENCES:
patent: 3051935 (1962-08-01), Willson
patent: 3133773 (1964-05-01), Ecker
patent: 3594770 (1971-07-01), Ham et al.
patent: 3609739 (1971-09-01), Walter
patent: 3909331 (1975-09-01), Cohen
patent: 4146293 (1979-03-01), Mutton et al.
patent: 4293778 (1981-10-01), Williams

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