Three ink storage chambers stored into a main body case of an ink cartridge is isolated from four surfaces of this main case body by way of a partition and depressing partition portions projected from this portion. Also, these ink storage chambers are isolated from a bottom portion of the main body case...http://www.google.de/patents/US6213600?utm_source=gb-gplus-sharePatent US6213600 - Ink-jet recording apparatus capable of limitedly using only genuine ink cartridge, ink cartridge usable in the same, and ink refilling member
