Abstract: Tagged articles are protected against theft by a system responding to articles having affixed thereto both a resonant circuit and a magnetizable strip. In one embodiment, a label alarm detector responds only to the presence of a resonant circuit or alternatively, only to the presence of a magnetizable strip. In a further embodiment, a label alarm detector responds to both presence of a resonant circuit and presence of a magnetizable strip.

Abstract: The method of producing an oscillating circuit on a label capable of being deactivated consists essentially of moving two surfaces of a capacitor together by a heated rod. Due to the heated rod dielectric material melts and the two capacitor surfaces become short circuited. Upon application of an appropriate current/voltage source, this short circuit is removed by burning or melting away to form a crater-like hole in a thinner surface of the capacitor. This produces a state of the label which allows, in a later deactivation step, a positive short circuiting. When the capacitor surfaces are moved together, the electrical connection between the two surfaces connects the crater forming source. Thereafter, a short circuit between the surfaces appears only when the label is passed through a deactivating station.

Abstract: The circuit arrangement has at least one electrically, cut conductor track on at least one surface of a support film, the support film being free of deformations and fluctuations in the thickness, both in the region of the conductor track covering it and outside this region. The edges of the conductor track have a projection in the form of a stamping burr. A negative circuit is applied to a stamping substrate or embossed in the latter by means of embossing dies or punching tools constituting a block; the conductor track representing the remaining positive circuit is transferred to the support film.

Abstract: The circuit arrangement has at least one electrically conductive cut conductor track on at least one surface of a support film, the support film being free of deformations and fluctuations in the thickness, both in the region of the conductor track covering it and outside this region. The edges of the conductor track have a projection in the form of a stamping burr. A negative circuit is applied to a stamping substrate or embossed in the latter by means of embossing dies or punching tools constituting a block; the conductor track representing the remaining positive circuit is transferred to the support film.

Abstract: By means of this invention electrical resonant circuits, specifically resonance labels having a capacitor and a coil on a dielectric are produced for reliable deactivation by means of an electrical discharge between the capacitor surfaces. Heretofore aluminum threads produced from the material of the capacitor surfaces is not supported in place so that it can break with handling and vibration and cause reactivated of the resonant circuit leading to a false alarm in the safety system. According to this method a plurality of conductive bodies of a size in the micron range, e.g. copper dust is introduced in the dielectric so that a spark from discharge of a capacitor will cause an electrically conducting connection between the capacitor surfaces, which is embedded in a thread like shape in the dielectric. By using copper dust, an alloy is formed with the aluminum which evaporates during the spark discharge such that the thread produced has a substantially larger ductility than pure aluminum.

Abstract: In order to produce resonance labels a coil having the shape of a spiral and a first capacitor surface located adjacent the innermost winding of the spiral and, furthermore, a supplementary surface adjacent the outer end of the spiral are produced at one side only of a supporting foil by an etching method from an aluminum foil arranged on the supporting foil. An aluminum foil strip is sealed onto the other side of the supporting foil at a superimposed position relative to the first capacitor surface, a few windings of the spiral and the supplementary surface to form the second capacitor surface. After establishing an electrical connection between this strip and the supplementary surface at the other side an electrical resonant circuit is produced. Due to the sealed on aluminum foil strip the etching procedure is reduced to only one side with the advantage that considerably less poisonous etching sludge is thus produced.