US Patent 7914134 Ink cartridges and inkjet printers

An ink cartridge includes an ink chamber configured to store an ink, and a wall which includes a first end and a second end opposite the first end. The ink cartridge also includes an ink supply portion configured to supply the ink from an interior of the ink chamber to an exterior of the ink chamber, and the ink supply portion is positioned at the wall adjacent to the second end of the wall. Moreover, the ink cartridge includes a protrusion extending from the wall, and the protrusion is positioned between the ink supply portion and the second end of the wall. In embodiment, the protrusion has a plurality of grooves formed therein. In another embodiment, the protrusion has a plurality of openings formed therethrough or therein.