Patent ID: 7528733

Claim:
A security case forming a container, comprising: a shell formed by a wall or lining fabricated totally of a laminate composite material, the wall or lining including at least three layers, having at least two of the layers conducting layers constituted by an electrical conducting material sandwiching in between an insulating intermediary layer made of an electrical insulating material, the conducting layers being made of an organic resin impregnated with a charge carrier or conducting agent, and wherein the two conducting layers of the wall or lining that form the shell include an array of electric connections, and wherein each of the conducting layers includes two connections, an electric supply connection and an electric measurement connection, so that under an electric supply to each layer, the wall or lining with its insulating intermediary layer behaves as a capacitor sensitive to physical modification to the structure, and wherein the case includes an electric supply and an electronic circuit which detects a variation of at least one of resistance or capacitance and generates a signal indicative thereof and an electronic circuit connected with the conductive plastic layers which detects changes in electrical properties of the shell.