Patent ID: 6767124
Filing Date: 2004-07-27
Classification: B01F,B24B

Abstract:
A slurry mixing feeder for feeding a slurry to a chemical mechanical polishing machine, said slurry containing liquids at a desired mixing ratio, said liquids including at least a dispersion of fine abrasive particles and a solution of an additive, comprising:suction ports for sucking said liquids, respectively, a number of said suction ports corresponding to that of said liquids; a discharge port for feeding said slurry to said chemical mechanical polishing machine; feed pumps arranged in feed lines for said respective liquids, said feed lines extending from said individual suction ports to said discharge port, for sucking said individual liquids in specific amounts to give said mixing ratio and delivering the thus-sucked liquids toward said discharge port; dampers and pressure-regulated restrictors arranged in combination in said feed lines on delivery sides of said feed pumps, respectively; and pressure sensors placed on said feed lines between said individual suction ports and said feed pumps, wherein power supplies to said feed pumps are configured to be controlled based on pressure fluctuations of said liquids measured by said pressure sensors.