Patent ID: 7192128

Claim:
An ink cartridge, comprising: an ink chamber comprising a first wall having a first end and a second end opposite the first end, and a second wall which is substantially perpendicular to the first wall and is connected to the second end of the first wall; a translucent portion positioned at the first wall, wherein the translucent portion is configured to be in fluid communication with the ink chamber, and the translucent portion has an inner space formed therein; an ink supply portion having an opening formed therethrough, wherein the ink supply portion is positioned at the first wall adjacent to the second end of the first wall, and the translucent portion is positioned between the first end of the first wall and the ink supply portion; a support member; and a rotatable member connected to the support member, wherein the rotatable member comprises: a pivot portion formed at a point of connection between the support member and the rotatable member; a signal blocking portion, wherein the signal blocking portion is disposed within the inner space of the translucent portion; and a float portion disposed within the ink chamber, wherein the float portion is positioned between the signal blocking portion and the pivot portion, and the float portion is configured to move between a first position and a second position based at least on an amount of ink disposed within the ink chamber.