Patent · US Expired

Anticopying film

US5795643A · kind A · utility

23Cited by

4References

14Claims

0Family size

Assignee

BASF Magnetics GmbH · DE

Inventors

Helmut Steininger · Neu-Anspach, DE
Peter Heilmann · Bad Dürkheim, DE
Peter Hewkin · Cambridge, GB

Key dates

Filing date	Feb 13, 1995
Grant date	Aug 18, 1998
Priority date	—
Expiry date	Feb 13, 2015

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/24901
WIPO fieldOptics
WIPO sectorInstruments

Abstract

An anticopying film or layer consists of a film or of a layer of transparent material having a large number of completely or partially nontransparent regions which are arranged distances apart and whose planes are arranged in about the same predetermined position relative to the surfaces of the film or of the layer so that, from a predetermined viewing angle onto the surfaces of the anticopying film, the latter is essentially transparent. The regions consist at least partially of photosensitive material which is converted by the action of radiation into nontransparent or reflecting material, it also being possible to provide, in the transparent plastics material, furrows or grooves in which the photosensitive material is present.

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