Patent · US Expired

Safeguard against falsification of securities and the like which is suitable for automatic machines

US4157784A · kind A · utility

46Cited by

6References

7Claims

0Family size

Assignee

GAO Gesellschaft für Automation und organisation mbH · DE

Inventors

Helmut Grottrup · Munich, DE
Wittich Kaule · Grafing, DE
Thomas A. Maurer · Munich, DE
Gerhard Stenzel · Germering, DE

Key dates

Filing date	Jun 9, 1978
Grant date	Jun 12, 1979
Priority date	—
Expiry date	Jun 9, 1998

Classification

Technology area (CPC G)Physics
CPC primaryG06K19/14
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

The valuable papers, such as the securities and the like, have safeguard elements against forgery or falsification and which can be mechanically examined using light of the visible, ultraviolet or infrared spectral regions and which are effective, particularly, against erasure. The paper is provided with a homogeneous protective coating which is applied either prior to or following the application of an information print by an ink impression. The paper, the protective coating and the printing ink have respective reflectance or fluoroescence properties such that, any damage to the protective coating, such as an attempted erasure, is detectable either at the wavelength of light serving to read the information print or at a special test wavelength.

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