Invisible, machine-detectable security marking, production...

Details Invisible, machine-detectable security marking, production... Invisible, machine-detectable security marking, production...

2008-07-22

2008-07-22

Morris, Terrel (Department: 1794)

Printed matter

Having revealable concealed information, fraud preventer or...

C283S088000, C283S089000, C283S091000, C252S587000, C252S588000, C270S052020

Reexamination Certificate

active

10299239

ABSTRACT:
The invention relates to a security marking whose level of proof against forgery is greater than that of known security markings, comprising liquid-crystalline material with chiral phase, wherein the security marking is imperceptible to the eye and the properties of the liquid-crystalline material with chiral phase can be detected with the aid of detection systems.

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Tissue, Electromagnetic Spectrum, http://www.chem.vt.edu-ed/light/em-spec.html, updated May 28, 2004.
Derwent Abstract (#91-231516[32]) corresponding to DE 3,942,663.
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Derwent Abstract (#89-107367 [15]) corresponding to DE 3,732,115.
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Derwent Abstract (#91-231516 [32]) corresponding to DE 3,942,663.
Derwent Abstract (#97-290514 [27]) corresponding to DE 19544130.

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