Authentication system, data device, and methods for using...

Registers – Coded record sensors – Particular sensor structure

Reexamination Certificate

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C369S275200, C250S486100

Reexamination Certificate

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10709208

ABSTRACT:
An authentication system may comprise: a first light source, a second light source, and at least three optically filtered light sensing devices. The first light source can have a first light source spectral distribution and can be capable of providing sufficient excitation to produce a photoluminescent emission from a medium comprising a luminescent tag and a color. The second light source can have a visible multi-wavelength spectral distribution and can be capable of providing sufficient visible multi-wavelength illumination of the medium to generate a second analog response. Each light sensing device can have a different device spectral sensitivity range.

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