A carton having a rectanguloid, cylindrical or other conventional shape formed from suitable material has a plurality of walls arranged to define a container body. One of the plurality of walls of the container body is provided with a section having two panels arranged in a gradually deepening infolded...http://www.google.fr/patents/US3998380?utm_source=gb-gplus-shareBrevet US3998380 - Carton having an openable and closeable pour opening
Carton having an openable and closeable pour opening
