Patent ID: 7226155

Claim:
An ink cartridge, comprising: an ink chamber comprising a wall having a first end and a second end opposite the first end; a translucent portion positioned at the 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; and a movable member comprising: a sliding member comprising a signal blocking end and a non-signal blocking end opposite the signal blocking end, wherein the signal blocking end is configured to move in a first direction from a first position within the inner space of the translucent portion to a second position based on the amount of ink within the ink chamber; and a float portion operationally coupled to the sliding member, wherein the float portion is disposed within the ink chamber and is configured to move in a second direction from a third position to a fourth position based on the amount of ink within the ink chamber, wherein a first distance between the float portion and the signal blocking end when the float portion is in the third position is greater than a second distance between the float portion and the signal blocking end when the float portion is in the fourth position, and a third distance between the float portion and the non-signal blocking end when the float portion is in the third position is less than a fourth distance between the float portion and the non-signal blocking end when the float portion is in the fourth position.