Patent ID: 6264064
Filing Date: 2001-07-24
Classification: B01J,C23C,Y02E

Abstract:
A chemical delivery system for delivering chemicals having at least a high purity adapted for semiconductor processing, comprising:at least one first reservoir for containing a fluid, adapted to change out upon substantially complete utilization of said fluid;at least one second reservoir for containing said fluid;a first conduit for transferring said fluid over time from said at least one first reservoir to said at least one second reservoir, said first conduit being metallic and having a first end in communication with said at least one first reservoir and a second end in communication with said at least one second reservoir, wherein said fluid being transferred from said at least one first reservoir to said at least one second reservoir flows through said first conduit from said first end to said second end;a first fluid sensor adjacent said first conduit, said first fluid sensor adapted to detect a presence of said fluid in said first conduit and to detect an absence of said fluid in said first conduit, wherein said first fluid sensor generates at least one first signal indicative of the presence of said fluid or the absence of said fluid; anda controller for receiving said at least one first signal, said controller being adapted to identify an empty condition in said at least one first reservoir upon receiving at least one first signal indicative of the absence of said fluid in said first conduit or upon not receiving at least one first signal indicative of the presence of said fluid in said first conduit.