Document having light-transmissive, electrically conductive authenticating interior layer
First Claim
1. A standardized document including an authenticating interior layer which is light-transmissive and has an area of at least 1 mm2, a thickness less than 20 nm, and an electrical resistivity less than 1000 ohms per square wherein the authenticating layer is sandwiched between antireflective thin film layers and, when the document is cut through the authenticating layer to expose a new edge, the authenticating layer at the edge is not visible to the naked eye.
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Accused Products
Abstract
A standardized document such as a credit card has a thin, light-transmissive, electrically conductive interior layer, the impedance, capacitance, or conductance of which can be sensed to indicate the authenticity of the document. When the document is cut to expose a new edge, the authenticating layer at that edge is not visible to the naked eye and hence should foil the ordinary counterfeiter.
81 Citations
14 Claims
- 1. A standardized document including an authenticating interior layer which is light-transmissive and has an area of at least 1 mm2, a thickness less than 20 nm, and an electrical resistivity less than 1000 ohms per square wherein the authenticating layer is sandwiched between antireflective thin film layers and, when the document is cut through the authenticating layer to expose a new edge, the authenticating layer at the edge is not visible to the naked eye.
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14. Document bearing visible indicia and comprising a plurality of laminae and including as an authenticating interior layer a lamina of electrically conductive material having an electrical resistivity less than 1000 ohms per square and a transmissivity to visible light of at least 70%, wherein said authenticating interior layer comprises a conductive thin film sandwiched between antireflective thin film layers.
Specification