Patent ID: 8230775

Claim:
A sealed capsule, for the preparation of a beverage, by means of pressurised extraction, comprising: a cup-shaped body having a flange at the top projecting radially outwards; and a flexible lid, welded to the flange of the cup-shaped body so as to define with the latter a sealed chamber which is impermeable to oxygen and moisture and contains a quantity of material in the form of granules for preparation of the beverage, wherein the granular material is preliminarily compressed inside said chamber in a direction perpendicular to a plane containing the flange with a compressive load between 2 and 50 Kg per cm 2 of the average cross-sectional area of the chamber, so as to form a compact tablet of said material, and wherein a vacuum is formed inside said chamber to a degree such that the lid adheres to the upper surface of said tablet.