Patent ID: 6666995
Filing Date: 2003-12-23
Classification: B22F,C01P,C09C,C09D,G03H,Y10T

Abstract:
A process for preparing finely divided particles, each of which has at least one embossed surface, comprising the steps of:(a) providing a sheet having a first side and a second side, at least one side of which has an embossment, in which said embossment comprises a diffraction grating pattern, a holographic image pattern, or a machine readable image visible solely by optical magnification; (b) depositing, in the form of a thin film having an inside surface and outside surface, an optically-effective material onto said embossment, so that the inside surface of the film adopts the complement of the embossment; (c) passing said sheet with said film of said material through a release environment which causes said film to separate from the sheet but which is non-destructive of said material, and (d) removing said film of said material from said sheet in a particulate form to produce the particles, and collecting the particles in a solvent which is non-reactive with said material.