US Patent 7556364 Ink cartridge with self sealing outlet valve

An ink cartridge for an inkjet printhead, the ink cartridge comprising: an ink storage volume; an outlet opening with an outlet valve for connection to an inlet on the printhead, the outlet valve having a stem positioned in the outlet opening, the stem having a radially extending valve seat; and, an annular skirt of resilient material extending from the side of the outlet opening to the valve seat; such that, the inlet on the printhead pushes the annular skirt off the valve seat to open the outlet valve upon installation of the cartridge.