Patent ID: 6460404
Filing Date: 2002-10-08
Classification: G01M

Abstract:
A system for detecting N2 leaks in a solvent pressure tank that surrounds a solvent bottle in a Edge Bead removal tool in a spin-on-glass coater; comprising:a) a solvent bottle surrounded by a pressure tank; a N2 gas-supply connected to said pressure tank and pressurizes the inside of said pressure tank and said solvent bottle with N2 gas; b) a pressure sensor connected to said pressure tank; wherein said pressure sensor senses the N2 pressure inside of said pressure tank; said pressure sensor detects when said solvent bottle is improperly installed in said pressure tank; said pressure sensor is connected to a interlock circuit; said interlock circuit is connected to a system board; wherein said system board notifies an operator when said pressure sensor detects an unsatisfactory N2 pressure inside said pressure tank and said solvent bottle; c) said solvent bottle contains a solvent; a solvent delivery line connects said solvent bottle to a solvent buffer tank; a buffer solvent in said solvent buffer tank; and d) a buffet solvent delivery line connected from said solvent buffer tank to a nozzle over a substrate.