Printed security feature, object comprising such a printed security feature, and process of producing the same

US9751355B2 · kind B2 · utility

Assignee

• KBA-NOTASYS SA · CH

Inventors

• Johannes Georg Schaede · Würzburg, DE
• Alexander Fellmann · Schweinfurt, DE

Key dates

• Filing date: May 13, 2014
• Grant date: Sep 5, 2017
• Expiry date: Oct 18, 2034

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B42D2035/26
• WIPO field: Other consumer goods
• WIPO sector: Other fields

Abstract

There is described a printed security feature (1) provided onto a printable substrate, which security feature includes a printed area (100) consisting of a multiplicity of adjacent rectilinear and/or curvilinear elements (110, 120) printed with a given spatial frequency. The rectilinear and/or curvilinear elements are printed with at least first and second inks which exhibit the same or substantially the same optical appearance when illuminated with visible white light, such that the security feature produces a first graphical representation when illuminated with visible white light, at least the first ink being an ink which responds to non-visible light excitation by producing a characteristic optical response differentiating the first ink from the second ink. The security feature produces a second graphical representation when illuminated with non-visible light, which second graphical representation exhibits a distinctive two-dimensional graphic element (B) which is revealed only when the security feature is illuminated with non-visible light. Inside boundaries (160) of the distinctive two-dimensional graphic element, a part (P3) of the rectilinear and/or curvilinear elements is …