Patent ID: 7078355
Filing Date: 2006-07-18
Classification: G03F

Abstract:
1. A method of coating a surface of a substrate with a polymer solution, comprising: providing the substrate; and dispensing the polymer solution onto the surface of the substrate using a coating system having a pump connected in-line with a buffer tank and a polymer solution source, the pump to draw the polymer solution from the polymer solution source and the buffer tank in a continuous fluid path to dispense the polymer solution, the polymer solution source being connected to a pressure source capable of causing the polymer solution to be transferred from the polymer solution source into the buffer tank, the buffer tank to maintain a constant level of polymer solution predetermined to be sufficient to prevent air from being drawn into a dispensing solution; and controlling a momentary valve placed between the pressure source and the polymer solution source that allows pressure to be applied to the polymer solution source, wherein a controlled activation of the momentary valve is needed to allow pressure to be applied to the polymer solution source; and wherein a fluid sensor and a release valve are placed in communication with the buffer tank for bubble release when bubbles are detected.