Patent ID: 7290871

Claim:
An ink cartridge, comprising: a cartridge body having external walls with interior surfaces, an open portion, and at least one outlet through which ink may pass to feed ink to an ejection device; a lid covering the open portion of the cartridge body, the lid having at least one ink reservoir pocket extending into the cartridge body, the pocket having an orifice in fluid communication with the outlet of the cartridge body and the pocket extending downwardly adjacent to the external walls for substantially the entire height of the external walls between the open portion and the outlet of the cartridge body; a pressure-regulating material residing in the pocket, wherein the pressure-regulating material at least partially fills the volume of the pocket and is in fluid communication with the orifice of the pocket; and an ink filter in fluid communication with the orifice of the pocket; wherein the ink filter is in contact with the pressure-regulating material protruding from the orifice of the pocket.