An ink cartridge for an ink jet printer having a housing having at least one wall. The ink cartridge further has at least two ink chambers for containing different ink accommodated in the housing. Ink supply ports are formed in one wall of the housing within each of the ink chambers. Each of the ink...http://www.google.de/patents/US6793330?utm_source=gb-gplus-sharePatent US6793330 - Ink cartridge for ink-jet printing apparatus
