Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Andrew John Farrall0
Keith Michael Barfoot0
Date of Patent
April 8, 2008
Patent Application Number
10451602
Date Filed
December 19, 2001
Patent Citations Received
Patent Primary Examiner
Patent abstract
A method of operating a security system includes making a plurality of security tags, each of which includes a plurality of particles randomly distributed in a light-transmitting matrix, providing a reader which includes means for causing light of one or more wavelengths to impinge on a security tag and means for interpreting the light reflected and/or refracted and/or diffracted by the particles in the matrix, and presenting said tags to said reader.
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