Patent ID: 7553005

Claim:
An ink cartridge detachably mountable on a printing apparatus, said printing apparatus having a print head and an ink supply needle supplying ink to the print head, comprising: an ink body for containing ink therein which has a bottom wall, a first side wall adjacent to the bottom wall, a second side wall disposed opposite to the first side wall, a third side wall which intersects with the first and second side walls and a fourth side wall that is perpendicular to the second side wall and is opposite to the third side wall; an ink supply section having an ink supply opening formed on the bottom wall at a position closer to the first side wall than the second side wall for allowing the ink supply needle to be inserted, the ink supply opening having a center axis; a memory having a contact terminal member disposed on and facing outward from the second side wall, a centerline of the contact terminal member extending in a direction parallel to the center axis of the ink supply opening; and an inverse mounting preventing rib that is engageable with the carriage of the printing apparatus when the ink cartridge is installed in a proper orientation on the printing apparatus, and the inverse mounting preventing rib lies on the fourth side wall.