Electromagnetic asset protection system
First Claim
1. The method of checking the security of an openable object which comprises (a) placing on said object across the openable area thereof a magnetic strip, and (b) subjecting said strip to a field affecting its magnetic status, detecting the field emanating from said strip, and giving an indication in response to said detected field of the presence or absence of a strip in proper condition.
1 Assignment
0 Petitions
Accused Products
Abstract
The security of articles, and particularly articles in transit, is checked by detecting the status of a magnetic strip attached to the articles at a strategic location when the strip is subjected to an electromagnetic field which causes the strip to substantially saturate magnetically, the status of an improper strip, that is to say, a strip whose electromagnetic properties differ from those of a proper strip as a result of physical modification or disparity, being reflected in the nature of the electromagnetic field emanating therefrom, detection of the status of that field providing an indication of whether the strip is proper or not. The same principles can be applied to the coding of articles for validation of identity or authenticity.
59 Citations
26 Claims
- 1. The method of checking the security of an openable object which comprises (a) placing on said object across the openable area thereof a magnetic strip, and (b) subjecting said strip to a field affecting its magnetic status, detecting the field emanating from said strip, and giving an indication in response to said detected field of the presence or absence of a strip in proper condition.
- 15. A device for use with an openable object for detecting whether said object has been opened which comprises a body securable to said object so as to extend across the openable portion thereof, said body comprising a magnetic strip which spans said openable portion and which has a shape factor such that when subjected to an external field the field emanating therefrom will be significantly different if said strip has been cut than if it has not been cut.
- 20. A device for use with an openable object for detecting whether said object has been opened which comprises a body securable to said object so as to extend across the openable portion thereof, said body comprising a magnetic strip which spans said openable portion and which has the characteristic that when it is cut its magnetic properties are substantially altered.
- 24. The method of identifying a package which comprises (a) placing on said package a magnetic strip which when exposed to a given external field produces an electromagnetic field of predetermined nature, and (b) subjecting said strip on said package to said given external field, detecting said field produced by said strip, and giving an indication in accordance with said detected field as to whether said detected field is of said predetermined nature or not.
Specification