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AssigneeGAO Gesellschaft fuer Automation und Organisation mbH
InventorsWittich Kaule, Gerhard Stenzel, Jurgen Moll, Gerhard Schwenk
Estimating the term…
In order to increase the protection of security documents such as ban notes, etc., against forgery, security threads are embedded in the document which have at least two areas extending in the longitudinal direction of the thread and differing in their physical properties. The thread is preferably a coextruded multicomponent synthetic thread whose individual components contain additives such as dyes or fluorescent substances and/or particles having electrical or magnetic properties. The testing of the authenticity of the security thread is directed toward the presence of these additives and their mutual geometrical distribution in certain areas of the security thread.
A security document comprising at least one elongated security thread said security thread being at least partially embedded within said document, said thread being visually detectable in incident and/or transmitted light said security thread further comprising a plurality of areas extending homogeneously along the entire length of the thread, said areas differing in terms of their detectable physical properties and being arranged so that said detectable physical properties can be visually detected from a surface of said document.
Dependencies are inferred from the claim text.