Laminated data carrier protected against forgery, particularly identification card

US4057919A · kind A · utility

Assignee

• GAO Gesellschaft für Automation und organisation mbH · DE

Inventors

• Wolfgang Gauch · Otterfing, DE
• Wittich Kaule · Grafing, DE
• Guenter Pauli

Key dates

• Filing date: Aug 13, 1976
• Grant date: Nov 15, 1977
• Expiry date: Aug 13, 1996

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/15
• WIPO field: Other consumer goods
• WIPO sector: Other fields

Abstract

The data carrier is of the type consisting of a data carrying paper blank interposed between two films bonded to the opposite surfaces of the paper blank at respective bonding interfaces. At least one of the bonding interfaces has local areas in which the bond between the film and the respective surface of the paper blank is at least weakened, or omitted, relative to the remainder of the respective bonding interface, so that, when an attempt is made to split the data carrier paper blank along a plane between its opposite surfaces, and the local areas are reached, the tear, following the course of least resistance, will turn toward the surface of the paper blank. This results in a tear at the local areas and thus in the destruction of the respective surfaces of the paper blank. The local areas may be randomly located in the bonding interface or interfaces and, if both bonding interfaces have the local areas, the local non-bonded areas may be randomly located in both bonding interfaces or may be congruently located in both bonding interfaces. The local areas may be formed by either applying a parting compound to the surface or surfaces of the paper blank at the local areas, before bo…