Patent ID: 7583194
Filing Date: 2009-09-01
Classification: B65D,G06K,G08B

Abstract:
1. A method of calibrating a security tag that is arranged for use with a container having a metallic portion, said method comprising: (A) providing a security tag capable of receiving a transmitted electromagnetic signal over the air from a transmitter and for returning a discernable electromagnetic signal to a receiver when operating in free space; (B) securing said tag within a tag holder that conceals said tag from view when said tag holder is engaged with the container; (C) engaging said tag holder to the container so that said tag is disposed over or under, but spaced from, said metallic portion of said container; (D) transmitting an electromagnetic signal to said tag, whereupon said tag provides a discernable return signal as a function of its location with respect to said metallic portion of said container; (E) determining the frequency and magnitude of said return signal; and (F) modifying at least one electrical parameter of said tag so that said return signal provided by said tag is within a desired frequency range and of minimum amplitude.