US Patent 8025379 Ink cartridges

An ink cartridge includes a case including a front face and a rear face opposite the front face, an ink supply portion positioned at the front face of the case, an air intake portion positioned at the case, and a movable member configured to move between a first position and a second position relative to the case. The ink cartridge also includes a resilient member having a first end which is coupled to the front face of the case and a second end which is coupled to the movable member. The movable and member and the resilient member are positioned outside the case. Moreover, the resilient member is configured to expand and to contract to move the movable member relative to the case between the first position and the second position.