MARKER Russian patent published in 2001 - IPC

FIELD: sensing devices for burglar alarms. SUBSTANCE: marker has base with adhesive layer, sensing member made of magnetically soft material, layer of magnetically hard powder of neodymium-iron- boron alloy; magnetically soft particles measure 5-30 mcm; mentioned amount of material by mass is equal to or greater than that of sensible member set on adhesive layer. Coercive force of magnetically hard powder is 960-1200 kA/m. Strong magnetic field is required to decontaminate marker. Marker is applied to articles to prevent their unauthorized carry through checkpoints at shops, libraries, museums, and the like and to make it impossible for unfair clients to influence alarm signal. EFFECT: simplified design of marker. 5 cl, 4 dwg