According to the Controller General of Patents, Designs & Trade Marks, "A rigid filter for capsules suitable for extracting beverages, comprising a flat body having a plurality of through filtering holes, which are sized so as to block the passage of solid particles and allow passage of brewed water or beverage, characterized in that the holes have a substantially symmetrical shape with respect to the middle plane of the flat body, so that the filter can be inserted into a capsule without taking care of the orientation of such holes with respect to the powdered substance within the capsule."
Name of Applicant: Illycaffe' S.P.A.
Name of Inventor: Claudio Bolzicco, Luca Mastropasqua, Frans Van Eeden and Bruno Dellapietra
Application No.: 665/KOL/2008 A
Date of filing of Application: 02/04/2008
Publication Date: 05/06/2009