Patent ID: 7309513
Filing Date: 2007-12-18
Classification: B01D,B01J,Y10S

Abstract:
1. A method of making a filter medium, comprising the steps of: (a) causing ingredients comprising singly or in combination a carbonate, a sulfate, a basic material, a copper-containing material, and a tungsten-containing material to be incorporated into one or more admixtures, wherein at least one of the ingredients comprises an ammonium constituent; (b) causing the one or more admixtures to impregnatingly contact a substrate, whereby an impregnated substrate is formed; (c) drying the impregnated substrate, wherein at least a portion of the drying occurs in a vacuum and at least a portion of the drying occurs at a temperature sufficiently high such that an acidic sulfate compound is formed on the substrate in situ.