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US 6,659,351 B1Granted
Electric effect-based security feature on security documents and on documents of value-proof process belonging thereto
AssigneeBundesdruckerei GmbH
InventorsAnett Bailleu, Frank Kappe
Life of this patent
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Abstract
A security feature is provided for value and security documents in the form of piezo security particles. Electrical and mechanical properties of the piezo-security particles are utilized to detect and evaluate the security feature of the value and security document.
Claims13
A value and security document, having particles with piezoelectric properties embedded in and distributed throughout the document.
A method for examining the authenticity of the value and security document, comprising the steps of:
- applying at least one signal to the document to cause piezoelectric particles embedded in and distributed throughout the document to oscillate;
- detecting oscillation responses of the particles;
- and
- analyzing said responses.
1 more element
Dependencies are inferred from the claim text.