Patent ID: 6260709
Filing Date: 2001-07-17
Classification: B01D,B07B,B24B

Abstract:
A method of physically separating particles of an abrasive media larger than a specified particle size cutoff limit from a chemical-mechanical polishing (CMP) slurry, said method comprising the steps of:(a) providing a filter media having a first and second side and being formed of at least one sheet of a porous membrane having a first and second surface defining a thickness dimension of said membrane therebetween, said membrane having a plurality of generally cylindrical capillary pores formed through said thickness dimension, each of said pores being of about the same diameter, said diameter of said pores being larger than said specified particle size cutoff limit;(b) supplying the CMP slurry to the first side of said filter media; and(c) passing the CMP slurry through said filter media to the second side thereof whereby at least a portion of said particles of said abrasive media larger than said specified particle size cutoff limit is retained on the first side of said filter media, said portion including particles which are smaller than said diameter of said pores of said membrane.