Gerhard Stenzel

Data carrier having an optically variable element and methods for producing it

Security paper with authenticity features in the form of substances luminescing only in the invisible region of the optical spectrum and process for testing the same

Record carrier with an optical variable element and method of producing it

Datentrager mit einem optisch variablen element

Antifalsification document having a security thread embedded therein and a method for producing the same

Security paper with authenticity features in the form of luminescing substances

Security document having a security thread embedded therein and methods for producing and testing the authenticity of the security document

Printed security with hallmarks

Printed document having a value and comprising a luminescent authenticity feature based on a host lattice

Security document with security features in the form of luminescing substances