An ink cartridge for an ink jet printer is provided with a container having at least a first wall. An ink supply port is formed through the first wall for supplying ink to the exterior of the container. An ink chamber and an ink supply chamber are formed by a membrane valve seat made of an elastic thin...http://www.google.fr/patents/US6948804?utm_source=gb-gplus-shareBrevet US6948804 - Ink cartridge for ink jet printer
