Patent ID: 6044981
Filing Date: 2000-04-04
Classification: A61K,B01D,B01J,B81B,B81C,C04B,C23C,G03F

Abstract:
A method for forming a microfabricated filter, comprising the steps of:providing a bulk substrate having a first surface;forming openings in said first surface of said bulk substrate;forming a sacrificial layer over at least part of said first surface of said bulk substrate;forming a thin film layer over at least part of said first surface of said bulk substrate and said sacrificial layer;forming openings through said thin film layer, wherein said openings through said thin film layer expose a portion of said sacrificial layer and are positioned relative to said openings in said bulk substrate such that said openings in said bulk substrate are at least partially blocked by said thin film structure and said openings in said thin film structure are at least partially blocked by said bulk substrate;etching a second surface of said bulk substrate opposite said first surface of said bulk substrate through to said openings in said first surface of said bulk substrate, wherein said etching forms openings through said bulk substrate; andremoving said sacrificial layer.