Patent · US Expired

Magnetic metallic safeguarding thread with negative writing

US5803503A · kind A · utility

15Cited by

11References

7Claims

0Family size

Assignee

GAO Gesellschaft für Automation und organisation mbH · DE

Inventors

Wittich Kaule · Grafing, DE
Michael Boehm · Ojai, US
Walter Schneider · Thalwil, CH
Theodor Burchard · Tegernsee, DE

Key dates

Filing date	Nov 21, 1996
Grant date	Sep 8, 1998
Priority date	—
Expiry date	Nov 21, 2016

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S428/915
WIPO fieldOther consumer goods
WIPO sectorOther fields

Abstract

The invention relates to a security document, in particular a bank note, identity card or the like, having a security element which is provided with characters, patterns, etc., visually readable at least in transmitted light and which is electrically conductive and bears additional substances for machine testing, and to a method for producing such a security element. The security element preferably consists of a transparent film strip that bears negative writing readily capable of visual checking and is additionally provided with electrically conductive and magnetic substances.

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