A refill unit that includes an ink cartridge formed by jointing a pair of body members, a case, a door for closing an opening of the case, a pushing unit disposed on the door and pushing the ink cartridge into the case, and a leg portion disposed on the pushing unit for contacting evenly with the ink...http://www.google.de/patents/US7669968?utm_source=gb-gplus-sharePatent US7669968 - Refill unit
