Patent ID: 6986739

Claim:
An apparatus for depositing a material on a substrate, comprising: a. at least one material dispenser, comprising: i. a tip orifice defining an opening through which the material exits the dispenser, ii. at least one elongate feed channel having an inlet and a spaced outlet adjacent the tip orifice, the at least one feed channel having material therein and being sized and shaped so that the material therein may flow through the at least one channel from the inlet to the outlet, and iii. a valve for controlling the flow of material through the outlet of the at least one feed channel, the valve being moveable between an open position, in which material is permitted to flow through the outlet, and a closed position, in which material is not permitted to flow through the outlet, and iv. an actuator operatively coupled to the valve for selectively moving the valve between the open position and the closed position, v. wherein the material is displaced forward as the valve moves to the open position and the material is sucked back as the valve is moved to the closed position.