Coding system for value documents
First Claim
1. A composition for forming a security coding, the composition comprising at least one pair of mutually associated luminescent substances, said at least one pair including first and second luminescent substances which emit in a joint emission range located outside the visible spectral range, the emission spectra of the first and second luminescent substances overlapping in at least a subrange of said joint emission range such that the emission spectrum of the first luminescent substance is complemented characteristically by the emission spectrum of the second luminescent substance, wherein the first and second luminescent substances emit in the subrange with respective emission spectra peaks so close as to practically prevent individual recognition of the first and second luminescent substances from an envelope of luminescent emissions defined by the joint emission range without further information, whereby the composition is usable as a security coding.
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Accused Products
Abstract
The invention relates to a composition for coding having at least one pair of mutually associated luminescent substances having first and second luminescent substances which emit in a joint emission range located outside the visible spectral range. The emission spectra of the first and second luminescent substances overlap in at least a subrange of the stated emission range such that the emission spectrum of the first luminescent substance is complemented by the emission spectrum of the second luminescent substance.
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Citations
36 Claims
- 1. A composition for forming a security coding, the composition comprising at least one pair of mutually associated luminescent substances, said at least one pair including first and second luminescent substances which emit in a joint emission range located outside the visible spectral range, the emission spectra of the first and second luminescent substances overlapping in at least a subrange of said joint emission range such that the emission spectrum of the first luminescent substance is complemented characteristically by the emission spectrum of the second luminescent substance, wherein the first and second luminescent substances emit in the subrange with respective emission spectra peaks so close as to practically prevent individual recognition of the first and second luminescent substances from an envelope of luminescent emissions defined by the joint emission range without further information, whereby the composition is usable as a security coding.
- 26. A value document comprising a composition forming a security coding, said composition comprising at least one pair of mutually associated luminescent substances, said at least one pair including first and second luminescent substances which emit in a joint emission range located outside the visible spectral range, the emission spectrum of the first and second luminescent substances overlapping in at least a subrange of the said joint emission range such that the emission spectrum of the first luminescent substance is complemented characteristically by the emission spectrum of the second luminescent substance, wherein the first and second luminescent substances emit in the subrange with respective emission spectra peaks so close as to practically prevent individual recognition of the first and second luminescent substances within an envelope of luminescent emissions defined by the joint emission range without further information, whereby the composition is usable as a security coding for the document.
Specification