Method to build a microfilter

US7081208B2 · kind B2 · utility

Assignee

• International Business Machines Corporation · US

Inventors

• Kenneth McCullough · Fishkill, US
• Wayne M. Moreau · Wappingers Falls, US
• Keith R. Pope · Danbury, US
• Robert J. Purtell · Potsdam, US
• John P. Simons · Cold Spring, US
• William A. Syverson · Colchester, US
• Charles J. Taft · Wappingers Falls, US

Key dates

• Filing date: Dec 16, 2002
• Grant date: Jul 25, 2006
• Expiry date: Jun 7, 2023

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01D2323/34
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Methods are provided for making microfilters by subtractive techniques which remove a component or part of a filter material to form pores in the filter material and additive techniques which deposit a filter material onto a porous underlying substrate. All the methods employ a supercritical fluid or mixture which have very high solvency properties and low viscosity and CO2 is the preferred supercritical fluid.