A security article comprises a substrate layer having a top surface and a bottom surface. The substrate layer is composed of an electrically nonconductive material. Deposited on the top surface of the substrate layer is a conductive thin film coating having a predetermined electrical resistance between...http://www.google.es/patents/US6031457?utm_source=gb-gplus-sharePatente US6031457 - Conductive security article and method of manufacture
Conductive security article and method of manufacture
