Patent ID: 7469443
Filing Date: 2008-12-30
Classification: B08B,H01L

Abstract:
1. A wafer cleaning brush, comprising: a core; and a plurality of spaced-apart nodules disposed to protrude from the core, each of the nodules having a first portion proximately located relative to the core, the first portion including a plurality of micro-size pores, and a second portion distally located relative to the core, the second portion including a plurality of nano-size pores, and each of the nodules including a protrusion of a first porous polymeric material having the plurality of micro-size pores and a layer of a second porous polymeric material having the plurality of nano-size pores coated over a part of the protrusion to form the second portion, with the first portion being an exposed part of the protrusion not coated by the layer.