A container of beverage sealed under pressure is provided with a secondary chamber in the form of a hollow insert adapted to provide a flow of gas through an orifice into the beverage when the container is opened. The insert is in the form of an elongate tubular member whose axis extends around...http://www.google.es/patents/US5670194?utm_source=gb-gplus-sharePatente US5670194 - Beverage container havinging interior secondary chamber for foam generation and method for producing same
Beverage container havinging interior secondary chamber for foam generation ...
