Patent · US Active

Colour laser marking of articles and security document precursors

US8912118B2 · kind B2 · utility

1Cited by

12References

16Claims

0Family size

Assignee

Agfa-Gevaert NV · BE

Inventors

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

Key dates

Filing date	Dec 6, 2011
Grant date	Dec 16, 2014
Priority date	—
Expiry date	Dec 16, 2031

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/24802
WIPO fieldTextile and paper machines
WIPO sectorMechanical engineering

Abstract

A method of color laser marking an article having a polymeric foil with at least one colorless layer containing an infrared absorber, a polymeric binder and a color forming compound; including the steps of:—laser marking the colorless layer with an infrared laser using a first laser operation mode to generate a blue or cyan color; and—laser marking the same colorless layer with an infrared laser using a second laser operation mode to generate a black color, wherein the first laser operation mode applies less energy to the colorless layer than the second laser operation mode. Also disclosed is an article, such as a security document, including a polymeric foil and a colorless layer containing laser marked graphical data having a blue or cyan color and laser marked information having a black color.

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