Patent · US Expired

Tamperproof document and a process for producing the same

US4456667A · kind A · utility

11Cited by

5References

14Claims

0Family size

Assignee

Agfa-Gavaert · BE

Inventors

Richarda Bochow · Bad Fallingbostel, DE
Helmut Bergmann · Bad Fallingbostel, DE
Siegfried Eikemeier · Soltau, DE

Key dates

Filing date	Jul 26, 1982
Grant date	Jun 26, 1984
Priority date	—
Expiry date	Jul 26, 2002

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/24893
WIPO fieldOther consumer goods
WIPO sectorOther fields

Abstract

The tamperproof document consists of a photographic material as information carrier which is laminated on one or both sides with a transparent foil. The foil is attached to the surface of the information carrier by a layer of adhesive containing poly-1,2-alkyleneimine. The document is eminently saft against falsification.

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