Patent ID: 7997700

Claim:
An ink cartridge, comprising: a planar bottom surface; a planar first surface intersecting with the planar bottom surface at a first intersection; a planar second surface intersecting with at least one of the planar bottom surface and the planar first surface at a second intersection; an ink chamber bounded, at least in part, by the planar bottom surface, the planar first surface and the planar second surface; an air introduction opening formed in the bottom surface; and an ink supply opening for supplying ink in the ink chamber to a location outside of the ink chamber, the ink supply opening being provided in the planar bottom surface; wherein: the first intersection has a first curvature with a first radius of curvature and the second intersection has a second curvature with a second radius of curvature and the first radius of curvature is smaller than the second radius of curvature; at least a portion of the first intersection is closer to the ink supply opening than at least a portion of the second intersection; the planar first surface, the planar second surface and the planar bottom surface are inner surfaces of the ink chamber, and the planar first surface extends in a first direction along the planar bottom surface and in a second direction away from the planar bottom surface.