Patent ID: 8007092

Claim:
An ink cartridge for a printer with an inkjet printhead, the ink cartridge comprising: a rigid housing, the housing having a docking face for abutting the printer such that when installed, the docking face faces downwards; an ink storage volume; an ink outlet valve for fluid communication with the printhead, the ink outlet valve being positioned in the docking face; a variable volume structure within the ink storage volume, the variable volume structure being inflatable with air and having a section upwardly displaceable within the ink storage volume as air inflates the variable volume structure during use; an air inlet positioned in the docking face, and spaced from the outlet valve, in fluid communication with the variable volume structure such that the air inlet lets air into the ink storage volume as ink is drawn out through the outlet valve; and, a conduit in the ink storage volume, one end of the conduit being connected to the ink outlet valve and other end being open to ink within the ink storage volume and positioned remote from the docking face such that the other end does not get obstructed by the variable volume structure as the variable volume structure inflates.