Patent ID: 7090880

Claim:
Container of substantially form-retaining material, which container is filled with a liquid, which must be provided prior to consumption with a foaming head, which liquid comprises dissolved therein a first gas, which container comprises: a circumferential wall; a base which is connected along its whole periphery to this wall or is integrally formed therewith; a cover which, after filling of the container with the liquid, is connected to the circumferential wall along its whole periphery; and a cartridge present in the container and at least partially filled with a second gas which under pressure serves as foaming medium, in the wall of which cartridge is situated at least one continuous hole for passage of gas; and in the free container space a second gas creating over pressure in the closed container; wherein the first gas is nitrous oxide, and the second gas is nitrogen, and wherein the nitrous oxide and nitrogen, in combination, provide the liquid with a stiff foaming head that is stable for 15 minutes at refrigerator temperatures.