Indicator for indicating authenticity

Details Indicator for indicating authenticity Indicator for indicating authenticity

2011-03-22

2011-03-22

Ross, Dana (Department: 3725)

Printed matter

Having revealable concealed information, fraud preventer or...

Utilizing electromagnetic radiation

C283S085000, C283S087000, C283S090000, C283S094000, C359S002000

Reexamination Certificate

active

07909364

ABSTRACT:
An object of the present invention is to provide an authenticity indicator that cannot be easily forged, that is clearly distinguishable, and that can be elaborately designed. An authenticity indicator101is in the form of a sheet and can be checked for its authenticity by observing the light reflected from it. The authenticity indicator comprises a first reflective layer12comprising a reflective area12athat reflects specified light, and a second reflective layer15that reflects specified light. The reflective area of the first reflective layer has a cholesteric liquid crystalline structure. The second reflective layer comprises a volume hologram.

REFERENCES:
patent: 7391546 (2008-06-01), Hoshino et al.
patent: 2002/0051264 (2002-05-01), Shiozawa et al.
patent: 2003/0133098 (2003-07-01), Hoshino et al.
patent: A 2004-133179 (2004-04-01), None
patent: B 3652487 (2005-03-01), None
3D Optical Systems http://www.3dopticalsystems.com/volumehologram.html.

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