Patent · US Expired

Thermoplastic film for use in the manufacture of forgery-resistant identification documents

US4381329A · kind A · utility

10Cited by

13References

26Claims

0Family size

Assignee

Hoechst GmbH · DE

Inventors

Hermann Dallmann · Wiesbaden, DE
Hans J. Palmen · Eltville am Rhein, DE

Key dates

Filing date	Jul 8, 1981
Grant date	Apr 26, 1983
Priority date	—
Expiry date	Jul 8, 2001

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/31938
WIPO fieldSurface technology, coating
WIPO sectorChemistry

Abstract

A thermoplastic protective film for use in the manufacture of forgery-resistant identification documents, comprising a base layer and a cover layer comprising a partially hydrolyzed olefin/vinyl ester copolymer. The cover-layer side of the film is laminated under the action of heat to the identification document.

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