Method of checking the authenticity of a document with a co-laminated fabric layer inside

US8619244B2 · kind B2 · utility

Assignee

• HID Global Corp. · DE

Inventors

• Hermann Hecker · Berlin, DE
• Andreas Griesbach · Erfurt, DE

Key dates

• Filing date: Apr 6, 2009
• Grant date: Dec 31, 2013
• Expiry date: May 29, 2030

Classification

• Technology area (CPC G): Physics
• CPC primary: G07D7/0034
• WIPO field: Control
• WIPO sector: Instruments

Abstract

A method to test the authenticity of a document (1), such as an ID, a passport or a card, protected against forgery, wherein it comprises at least an inner co-laminated fabric layer (2) forming an optical watermark. This layer presents cuts, and so separated zones with fabric material and other zones without fabric material, forming well recognizable forms or pictures. Co-laminating one or a plurality of such fabric layers inside of the document body allows to create a multiple watermark having both surface relief and opacity effect, without adding any volume to the body of the document.