A valve for a reclosable container comprises first and second opposing layers of a film material, wherein an overlap region of the second layer overlaps the container, and the first layer is sealed to the second layer around a portion of the second layer. The second layer is sealed to the container around...http://www.google.es/patents/US7874731?utm_source=gb-gplus-sharePatente US7874731 - Valve for a recloseable container
