US 12,288,438 B2
Procedure for determining the authenticity of an object
Benedikt Daumann, Wallersdorf (DE); Thomas Kaib, Eisenach (DE); Thomas Bitzer, Mönchengladbach (DE); Dominik Uhlich, Bad Liebenstein (DE); and Walter Braumandl, Thurmansbang (DE)
Assigned to SENSOR-INSTRUMENTS ENTWICKLUNGS- UND VERTRIBES-GMBH, Thurmansbang (DE); and LEUCHTSTOFFWERK BREITUNGEN GMBH, Breitungen (DE)
Appl. No. 18/682,583
Filed by LEUCHTSTOFFWERK BREITUNGEN GMBH, Breitungen (DE); and SENSOR-INSTRUMENTS ENTWICKLUNGS- UND VERTRIEBS-GMBH, Thurmansbang (DE)
PCT Filed Jul. 26, 2022, PCT No. PCT/IB2022/056898
§ 371(c)(1), (2) Date Feb. 9, 2024,
PCT Pub. No. WO2023/017347, PCT Pub. Date Feb. 16, 2023.
Claims priority of application No. 102021120981.1 (DE), filed on Aug. 12, 2021.
Prior Publication US 2024/0331480 A1, Oct. 3, 2024
Int. Cl. G07D 7/1205 (2016.01)
CPC G07D 7/1205 (2017.05) 12 Claims
OG exemplary drawing
 
1. A method for determining an authenticity of an object, comprising the following steps:
marking the object with a first luminescent material with a first decay behavior over time,
marking the object with a second luminescent material with a second decay behavior that differs from the first decay behavior,
exciting the first and second luminescent materials with a light pulse,
measuring an afterglow intensity of both the first and second luminescent materials after the exciting with the light pulse,
forming a difference signal or identity signal from the afterglow intensities, measured over an elapsed time,
determining a time of a zero crossing of the difference signal or a time of the identity signal of a comparator, and,
comparing the time determined by the zero crossing or by the identity signal with a setpoint value.