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Brush for cleaning wafer

  • US 7,469,443 B2
  • Filed: 01/10/2005
  • Issued: 12/30/2008
  • Est. Priority Date: 01/10/2005
  • Status: Expired due to Fees
First Claim
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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.

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