Patent · US Expired

Multilayer identification card and a method of producing it

US4507346A · kind A · utility

56Cited by

3References

30Claims

0Family size

Assignee

GAO Gesellschaft für Automation und organisation mbH · DE

Inventors

Thomas Maurer · Munich, DE
Hans J. Holbein · Munich, DE
Joseph Lass · Munich, DE

Key dates

Filing date	Mar 25, 1983
Grant date	Mar 26, 1985
Priority date	—
Expiry date	Mar 25, 2003

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/24934
WIPO fieldOther consumer goods
WIPO sectorOther fields

Abstract

A multilayer identification card bearing information such as letters, numbers, patterns, pictures and so on, in which at least part of the information is present in the form of a structure in relief in a foamable synthetic material. The foamable synthetic material is transparent or dyed in the visible spectral range and is present in the identification card in the form of a layer covering either its entire surface or part of it. The information in relief is produced by means of a laser beam recorder, the energy dosage of which is used to induce the locally controllable foaming process in the synthetic material compounded with chemical or physical blowing agents. The protection against forgery may be further increased by additionally photocuring the foamable synthetic layer.

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