Patent ID: 7434922

Claim:
An ink cartridge, comprising: a cartridge case having a first side wall, a second side wall opposite from the first side wall, a front wall and a back wall opposite from the front wall; and a bottom plate having a first side edge, a second side edge opposite from the first side edge, a front edge, a back edge opposite from the front edge, a top surface and a bottom surface opposite from the top surface; wherein: the cartridge case is welded to the bottom plate such that the first side wall contacts the top surface at a location adjacent to the first side edge, the second side wall contacts the top surface at a location adjacent to the second side edge, the front wall contacts the top surface at a location adjacent to the front edge, and the back wall contacts the top surface at a location adjacent to the back edge; and the bottom surface of the bottom plate includes a first at least one region having a raised profile relative to an adjacent region of the bottom surface, the first at least one region being situated in a location on the bottom surface opposing the locations at which the first side wall, the second side wall, the front wall and the back wall are in contact with the top surface of the bottom plate.