Patent ID: 7556694

Claim:
Apparatus for applying a coating of a substance to a substrate, wherein a predetermined concentration of the substance is mixed with a solvent to formulate a solvent bath, and wherein the coating substantially is applied to one substantially planar side only on the substrate, comprising: means for containing the solvent bath so that a bath surface on the solvent bath is substantially flat and free of disturbance, means for positioning the one substantially planar side only in contact with said bath surface, means for tilting the one substantially planar side to assume a predetermined angle with respect to said bath surface, while remaining in contact therewith, wherein the means for tilting is adapted so that only a single meniscus is formed between the one substantially planar side and said bath surface, and means for separating the one substantially planar side from said bath surface; wherein the single meniscus travels across the one substantially planar side at a predetermined speed.