Patents Assigned to Giesecke & Devient GmbH
  • Coding system for value documents
    Patent number: 7927511
    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.
    Type: Grant
    Filed: October 5, 2004
    Date of Patent: April 19, 2011
    Assignee: Giesecke & Devient GmbH
    Inventors: Thomas Giering, Wolfgang Rauscher