US Patent 7540392 Permeable containment apparatus for a receptacle

The present invention provides a permeable containment apparatus for a receptacle having a vertical containment wall, an open end, and an upper wall region terminating at a peripheral edge, including a securing portion having an annular biasing mechanism adapted to maintain said securing portion in contacting relationship with the upper wall region of said receptacle, a substantially permeable cover portion attached to said securing portion and covering the open end of said receptacle, and wherein said permeable cover portion is adapted to contain receptacle content while allowing for substantial aeration of said receptacle.