Security element, thermal transfer sheet, intermediate...

Details Security element, thermal transfer sheet, intermediate... Security element, thermal transfer sheet, intermediate...

2006-05-02

2006-05-02

Hess, B. Hamilton (Department: 1774)

Stock material or miscellaneous articles

Receiver for thermal transfer ink

Retransferable

C156S235000, C283S114000, C428S032600, C428S032690, C428S032740

Reexamination Certificate

active

07037561

ABSTRACT:
The present invention provides a security element which is low in cost, is difficult to forge or alter, and can be applied to objects where a high level of security is required. The security element comprises at least a substrate and a fluorescent colorant layer provided on the substrate, wherein the fluorescent colorant layer comprises N species of fluorescent colorants Fn, wherein N is an integer of 2 or more and n is an integer of not less than one and not more than N, in the same layer, and the fluorescent colorant Fnabsorbs light with a wavelength of λnand emits fluorescence with a wavelength of λn+1.

REFERENCES:
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patent: 6308630 (2001-10-01), Kurokawa et al.
patent: 6368684 (2002-04-01), Onishi et al.
patent: 0 595 583 (1994-05-01), None
patent: 1 179 808 (2002-02-01), None
patent: 1 270 246 (2003-01-01), None

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