Methods and apparatuses for checking the authenticity of...

Details Methods and apparatuses for checking the authenticity of... Methods and apparatuses for checking the authenticity of...

2008-04-08

2009-06-23

Porta, David P (Department: 2884)

Radiant energy

Invisible radiant energy responsive electric signalling

Ultraviolet light responsive means

C209S534000, C382S135000, C382S137000, C705S045000

Reexamination Certificate

active

07550736

ABSTRACT:
Ultraviolet light is used for checking the authenticity of sheet material, in particular bank notes, whereby the ultraviolet light transmitted, i.e., pervading the sheet material to be checked, is used for checking authenticity.

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