Security, identificaiton and verification systems
First Claim
1. A method of producing a tag which comprises the application to a substrate of a matrix containing randomly distributed particles some at least of which include a reflective layer/component and/or a refractive layer/component.
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Accused Products
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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Citations
32 Claims
- 1. A method of producing a tag which comprises the application to a substrate of a matrix containing randomly distributed particles some at least of which include a reflective layer/component and/or a refractive layer/component.
- 4. A method of operating a security system, said method comprising making a plurality of 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 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.
- 27. A method of making a tag substantially as hereinbefore described with reference to the accompanying drawings.
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32. A tag for security, identification or verification purposes produced using any one or more of the particulate materials hereinbefore described.
Specification