Patent ID: 6338361
Filing Date: 2002-01-15
Classification: F16K,G03F,Y10T

Abstract:
A flow-resistance-control apparatus with a check function for a photoresist solution, the apparatus being connected to a photoresist supply device, the photoresist supply device comprising a tank for storing the photoresist solution, a portion of a pipe partially submerged in the photoresist solution in the tank to transport the photoresist solution, and a pump for drawing the photoresist solution out of the tank, the apparatus comprising a number of housings and each housing comprising:a chamber, a top opening positioned at the top of the chamber, and a bottom opening positioned at the bottom of the chamber; wherein the top opening can be mated to an end of the pipe or to a bottom opening of another housing; and a sphere moveably set inside the chamber; wherein when the photoresist solution is exchanged for a new photoresist solution with a lesser viscosity, the number of housings connected in series is increased to provide a suitable increase in flow resistance of the new photoresist.