Filter for rapid extraction of the aromatic substances of a product by a liquid under pressure, and an apparatus equipped with a filter of this type

A filter for the preparation of beverages by rapid extraction by a liquid under pressure of soluble aromatic substances of a product contained in a treatment vessel having a bottom wall closed by the filter, said filter comprising a plurality of orifices, each orifice adapted to cooperate with resilient closure means which free said orifices so as to provide a plurality of narrow passageways when a predetermined pressure of said liquid is attained within the vessel, the width of each passageway being sufficiently small to ensure filtration of the liquid which has been in contact with said product, wherein the resilient closure means are constituted by a plurality of uniformly spaced resilient tongues which are attached to the filter and substantially close off said orifice, said filter further comprising a circular thin disc of flexible material, said filter having a periphery resting on the top face of a filter carrier, said top face having an annular groove for collecting filtrate, said resilient tongues being located above said annular groove when the filter is in a service position on the filter carrier, said filter carrier having on its top face a central portion which is radially internal with respect to the annular groove, and projects with respect to said groove, but is set back with respect to the peripheral portion of the filter carrier so as to limit the deformation of the central portion of the filter.