Patent ID: 7549591
Filing Date: 2009-06-23
Classification: G06K,H05K

Abstract:
1. An electromagnetically readable bar code, comprising: a series of bars and spaces forming a bar code such that the bar code is optically readable by a bar code reader to determine information optically encoded by the bar code; and a first resonant structure embedded within at least one bar of the bar code such that the first resonant structure resonates in response to a first frequency; and a second resonant structure embedded within at least one bar of the bar code such that the second resonant structure resonates in response to a second frequency which is different than said first frequency, wherein the bar code is split into at least first and second sections along a line of symmetry, and wherein the first resonant structure is embedded within at least one bar of the bar code in the first section and wherein the second resonant structure is embedded within at least one bar of the bar code in the second section.