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Marker for an article which is detected when it passes through a surveillance zone

  • US 5,767,772 A
  • Filed: 08/08/1996
  • Issued: 06/16/1998
  • Est. Priority Date: 12/15/1993
  • Status: Expired due to Fees
First Claim
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1. A marker intended to be detected when it passes through surveillance zones, and emitting an alarm signal as soon as an attempt is made to remove it from the article to which it is attached, of the type comprising an electronic circuit with an electronic module and a detecting means (15, 122, 130) of which one electric, chemical or electrochemical feature is modified when an attempt is made to remove said marker from the article to which it is attached, and an electronic module (13) capable of detecting the modification in the detecting means and of informing monitoring means thereof, characterized in that it comes in the form of an adhesive label comprising a bottom layer (100) bearing a first adhesive (102) by way of which it is applied to the article to be protected, and a peel-off layer (200) fixed to the bottom layer (100) by a second weaker adhesive (202) with lower tear resistance than said first adhesive (102) in order to ensure that said second adhesive (202) yields first when an attempt is made to remove the label from the article to which it is attached, thereby leading to a tearing of the peel-off layer (200) while the bottom layer (100) remains fastened to the article, and in that the detecting means (15, 122, 130) is located between the peel-off layer (200) and the bottom layer (100) so that its electric, chemical or electrochemical feature is modified when the peel-off layer (200) is removed.

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