An ink jet printer has an ink jet record head, an ink cartridge for supplying ink to the ink jet record head, the ink cartridge having a semiconductor storage system storing at least the data defining the effectively usable period since the ink cartridge was placed in the printer, and a control system...http://www.google.es/patents/US6497469?utm_source=gb-gplus-sharePatente US6497469 - Print system, ink jet printer and ink cartridge
