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US 2006/0131425 A1Published application
Value document comprising a machine-readable authenticity mark
AssigneeGiesecke & Devrient GmbH
InventorsGerhard Stenzel, Wittich Kaule, Gerhard Schwenk
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Abstract
The invention relates to a value document having a machine-readable authenticity mark. According to the invention the authenticity mark comprises a luminescent marking substance and a marking substance absorbing in the infrared spectral range.
Claims57
A value document having a machine-readable authenticity mark, characterized in that the authenticity mark comprises a luminescent marking substance emitting in the infrared spectral range, and a marking substance absorbing in the infrared spectral range.
(canceled)
Dependencies are inferred from the claim text.