An ink cartridge (1) for supplying the ink in an ink reserving chamber (3) via an ink supply port (4) into a recording head (21) has a differential pressure valve mechanism (5) disposed between an ink flow port (7) and the ink supply port (4) in the ink reserving chamber (3), whereby the ink is supplied...http://www.google.com.au/patents/US20050057626?utm_source=gb-gplus-sharePatent US20050057626 - Ink cartridge for ink jet recording apparatus, connection unit and ink jet recording apparatus
