Patent ID: 7222951

Claim:
An ink cartridge system, comprising: at least three ink cartridges, comprising: a first ink cartridge; a second ink cartridge; and a third ink cartridge, wherein a size of the first ink cartridge is not equal to a size of the second ink cartridge, the size of the first ink cartridge is not equal to a size of the third ink cartridge, and the size of the second ink cartridge is not equal to the size of the third ink cartridge, wherein each of the at least three ink cartridges comprises: a case, comprising: a first case member; and a second case member connected to the first case member, wherein each of the first case member and the second case member comprises: a first wall; and at least one second wall, wherein an area of the first wall is greater than an area of the at least one second wall, and the at least one second wall is perpendicular to the first wall, wherein an area of the at least one second wall of the first case member of the first ink cartridge is the same as an area of the at least one second wall of the first case member of the second ink cartridge, and an area of the at least one second wall of the second case member of the second ink cartridge is the same as an area of the at least one second wall of the second case member of the third ink cartridge.