Pharmaceutical tablets with diffractive microstructure and compression tools for producing such tablets

Abstract

A tablet (4) for pharmaceutical use has on at least one part of its surface a diffractive microstructure (11) which generates diffraction effects which can be perceived in the visible spectral range and which serve as visual safety feature. The tablet (4) consists of a plurality of individual powder particles, where the diffractive microstructures (11) are impressed into the surface of the individual powder particles. A compression tool (1, 1a, 1b, 3) to produce such tablets (4) has on one pressing surface of the compression tool (1, 1a, 1b, 3) micro-structures (11), where said microstructures (11) have dimensions which are smaller than the dimensions of the individual crystallites (30) of the material of the pressing surface of the compression tool (1, 1a, 1b, 3). The micro-structures (11) of the compression tool can be produced for example by ion etching or by imprinting.

Dependencies are inferred from the claim text.