Method for Labelling Products with an Optical Security Feature with a Temporal Dimension
AssigneeFraunhoffer-Gesellschaft Zur FöRderung Der Angewandten Forschung E. V.
InventorsTobias Jochum, Jan Niehaus
Life of this patent
Estimating the term…
Abstract
The present invention is based on a method for marking products using two or more ink formulations, each containing one or more photoluminescent dyes emitting radiation in the range of 380-3000 nm under photon excitation and distinguished by different fluorescence lifetimes, for storing information in serialization and/or track & trace systems and for document security.
Claims23
A method of labeling products comprising:
- providing two or more ink formulations, each containing one or more photoluminescent dyes, that emit radiation in the range of 380-3000 nm under photon excitation, wherein the ink formulations differ by different photoluminescence lifetimes of the photoluminescent dyes;
- generating a multi-dimensional code for identifying a product, wherein at least one dimension is a spatial dimension and one dimension is a temporal dimension, based on the photoluminescence lifetimes of the photoluminescent dyes;
- printing the ink formulations on at least one area of the surface of the product in the form of said multi-dimensional code;
- irradiating the product printed with the ink formulation with photons;
- detecting the radiation emitted by the irradiated product in the range from 380 to 3000 nm, as well as the time course of this radiation over a period of time from 1 ns to 1 min.
(canceled)
(canceled)
An optical, time-dependent security feature on at least one surface area of a product in the form of a multidimensional code containing two or more photoluminescent dyes that emit radiation in the range of 380-3000 nm under photon excitation and differ in their photoluminescence lifetimes.
-23. (canceled)
Dependencies are inferred from the claim text.