Patent ID: 7438019

Claim:
An integrated pneumatically operated dispenser comprising: a fluid supply in communication with a treatment composition; a first piston in communication with the fluid supply, the first piston moving between a first position and a second position and wherein movement from the first position to the second position causes a selected amount of treatment composition from the fluid supply to be drawn into a chamber within the dispenser, and movement of the piston from the second position to the first position causes the selected amount of the treatment composition to be forced out of the chamber; an injection device in communication with the chamber for receiving the treatment composition when the first piston moves from the second position to the first position; a second piston connected to the injection device, the second piston moving between a first position where the injection device is retracted and a second position where the injection device is extended; and a first gas inlet and a second gas inlet, the first and second gas inlets being in communication with the first piston and the second piston, wherein, by flowing a gas into the first gas inlet, the first piston moves from the first position to the second position and the second piston is forced toward the first position where the injection device is retracted, and wherein, by flowing a gas into the second gas inlet, the first piston moves from the second position to the first position and the second piston is forced towards the second position for dispensing the treatment composition while the injection device is extended.