Patent ID: 7730849

Claim:
An apparatus for coating a photoresist material onto a substrate, the apparatus comprising: a lid having one or more nozzle holders to house a nozzle; a solvent pipeline provided below the lid to guide the solvent to a solvent drain member; a solvent supplying port to supply the solvent into the solvent pipeline; a first solvent trap provided below the nozzle and configured to trap the solvent supplied by the solvent supplying port and prevent the formation of powders on the lid or the nozzle or both; a second solvent trap coupled to the solvent pipeline to trap the solvent received from the solvent pipeline; and the solvent drain member configured to receive the solvent from the second solvent trap, wherein the solvent supplying port is provided closer to the first solvent trap than the second solvent trap, the nozzle being positioned over the first and second solvent traps between coating operations.