Patent ID: 7497355

Claim:
A fluid cartridge for storing and dispensing two fluids, comprising: an outer cartridge wall defining an outlet and an open end opposite the outlet; a delivery tube disposed within the outer cartridge wall and defining an outlet that is co-located with the outlet defined by the outer cartridge wall; a first piston disposed between the outer cartridge wall and the delivery tube forming a first fluid chamber; a second piston disposed within the outer cartridge wall between the first piston and the open end of the outer cartridge wall; a post connected to and extending from the second piston in alignment with the delivery tube, wherein the post has a single groove formed on an outer surface thereof along the length of the post; a fixed wall disposed between the first piston and the second piston, wherein the fixed wall and the second piston define a second fluid chamber; and means for transmitting force from the second piston to the first piston.