Patent ID: 8757417

Claim:
A container comprising: at least one chamber which can be filled with a liquid medium through a filler neck; a cover which is configured to be fastened to the filler neck; means for equalizing the pressure between the chamber and the atmosphere; a unitary sealing element that is configured to prevent the liquid medium from emerging from the chamber, wherein the unitary sealing element includes a funnel-shaped element defining a space which is exposed to the atmosphere and has one or more holes facing the chamber, and first and second concentrically encircling projections on an underside surface of the cover, wherein each of the first and second encircling projections is interrupted by a gap, wherein after the installation of the cover, the first and second encircling projections bear against an upper side of the sealing element and the gaps that are formed in the first and second encircling projections together form an air duct for the passage of air out of the container, a third encircling projection on an underside surface of the cover that is configured to be fastened to the sealing element and is spaced radially inwardly from the first and second concentrically encircling projections, wherein the funnel-shaped element includes a narrowed end extending in a direction of the chamber at which the holes are provided, wherein the unitary sealing element has a peripheral projection on an outer side of the funnel-shaped element that is positioned at a location adjacent the one or more holes which is directed axially towards the chamber and projects over the one or more holes such that the peripheral projection is positioned at a lower elevation within the chamber than the one or more holes, and wherein the space is configured such that liquid medium penetrating the space undergoes an increase in its surface area while its volume remains substantially constant when displaced by means of a gaseous medium, and, the liquid medium is urged back into the chamber such that the gaseous medium can flow into the atmosphere through the unitary sealing element when a threshold surface tension of the liquid medium is reached.