Patent ID: 6475351
Filing Date: 2002-11-05
Classification: B01J,G01N,H02N,Y10S,Y10T

Abstract:
A method for adhering charged grains to a bead collection zone on a bead contact surface comprising:(1) adhering a substrate to an electrostatic chuck, with the substrate arrayed over a grain-attracting electrode of the electrostatic chuck so that a surface of the substrate defines the bead contact surface; (2) applying an AC waveform potential to the grain-attracting electrode to create a grain attracting field, wherein the AC waveform potential comprises a grain-attracting potential pulse followed by a recovery period adapted to allow an effective grain attraction potential at the bead collection zone on activation of a subsequent grain-attracting potential pulse; and (3) attracting and retaining grains to the bead collection zone.