Patent · US Active

Security documents and colour laser marking methods for securing them

US8975211B2 · kind B2 · utility

1Cited by

12References

15Claims

0Family size

Assignee

Agfa-Gevaert NV · BE

Inventors

Bart Waumans · Mortsel, BE
Ingrid Geuens · Emblem, BE
Paul Callant · Edegem, BE
Hubertus Van Aert · Pulderbos, BE

Key dates

Filing date	Dec 2, 2011
Grant date	Mar 10, 2015
Priority date	—
Expiry date	Dec 25, 2031

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S430/146
WIPO fieldTextile and paper machines
WIPO sectorMechanical engineering

Abstract

A security document precursor including, in order, at least: a) a transparent biaxially stretched polyethylene terephthalate foil; b) a colorless color forming layer containing at least an infrared absorber, a color forming component and a polymeric binder; and c) a polymeric support; wherein the colorless color forming layer contains at least one component forming a compound having a melting temperature of less than 20° C. upon laser marking the colorless color forming layer with an infrared laser. Methods for securing a security document using the security document precursor are also disclosed.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.