Patent ID: 7380909

Claim:
An ink cartridge that is inserted into to a cartridge holder of a recording apparatus and is attached to the cartridge holder during a recording operation to supply ink to the recording apparatus, comprising: an ink cartridge case having an ink chamber containing the ink; an ink outlet port that is in fluid communication with the ink chamber and that is disposed at a first side of the ink cartridge case; a first structure, which is at least partially formed at the first side of the ink cartridge case; and a first positioning opening formed on the first side of the ink cartridge case, the first positioning opening receiving a first positioning pin formed on the cartridge holder when the ink cartridge is inserted into the cartridge holder; wherein, when a first characteristic of the ink is compatible with a second compatible structure formed on the cartridge holder, the first structure is adapted to accept the second compatibility structure to enable the ink cartridge to be attached to the cartridge holder, wherein the second compatibility structure depends on the first characteristic of the ink.