Patent ID: 9714136
Date: 2017-07-25
CPC Classifications: B65D

Claim:
1. A pad containing a coffee product to be extracted for preparing a beverage, the pad comprising: a substantially flexible bottom sheet manufactured from filtering paper and having a circumferential edge, and a substantially flexible top sheet manufactured from filtering paper and having a circumferential edge, wherein the top sheet and the bottom sheet are interconnected at their circumferential edges to form a covering with a circumferential sealing seam with the coffee product situated between the top sheet and the bottom sheet, wherein the bottom sheet and the top sheet each form a filter which is substantially impermeable to the product and which is permeable to water, wherein the covering outside the sealing seam is substantially flexible, wherein the covering includes an impermeable area that is substantially impermeable to water, the impermeable area is disposed along an annular portion of the sealing seam and extends from the annular portion of the sealing seam over only a limited portion of the bottom sheet, limited to ensure that the bottom sheet remains permeable to water, wherein the annular impermeable area comprises, at the bottom sheet, an annular bottom sheet sub-area which extends radially inside the sealing seam, wherein part of the impermeable sub-area that extends radially inside the sealing seam is adjacent to the coffee product at the bottom sheet, and wherein the annular impermeable area extends only adjacent to the coffee product at the bottom sheet, wherein the annular impermeable area is further provided with at least one of a fixing opening and an indentation, so that in use the pad can be accurately positioned in a holder having at least one co-operating projection to ensure that in use, the area that extends inwardly of the sealing seam is configured to cover at least one pressure limit opening of the holder and to allow water to flow under the annular impermeable area to the at least one pressure limit openings to discharge water and have the pressure in the holder rise no further only when the pressure in the holder will increase to a threshold pressure, which causes the pressure drop across the pad to be very small, and the pad and annular impermeable area are no longer firmly pressed against the bottom.