Patent ID: 7188939

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 portion, wherein the signal blocking portion 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 when the float portion moves from the third position to an intermediate position between the third position and the fourth position, the sliding member is substantially stationary.