Patent ID: 6045437
Filing Date: 2000-04-04
Classification: B24B

Abstract:
A machine for polishing flat substrates, said machine comprising:a top platen, a first polishing pad being attached to a bottom surface of said top platen;a bottom platen, a second polishing pad being attached to a top surface of said bottom platen, said top and bottom platens capable of being juxtaposed so as to create a polishing chamber for polishing a flat substrate;a first conduit for introducing a first abrasive slurry into said polishing chamber, a flow of said first slurry in said first conduit being controlled by a first valve; anda second conduit for introducing a second abrasive slurry into said polishing chamber, a flow of said second slurry in said second conduit being controlled by a second valve, wherein said first slurry has a grit larger than a grit of said second slurry.