An ink cartridge including a case having an ink absorbent received therein and an ink-dispensing outlet provided at a bottom thereof, and a cover closing the case is provided. The cover is provided with at least an ink-filling hole, a vent hole vertically extending down into the case, and a capped ink-refilling...http://www.google.de/patents/US6350026?utm_source=gb-gplus-sharePatent US6350026 - Ink cartridge
