Filters having improved permeability and virus removal...

Liquid purification or separation – Filter – Material

Reexamination Certificate

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Details

C210S510100, C210S501000, C210S502100, C210S503000, C210S087000, C210S090000, C210S282000, C096S153000, C096S226000, C095S285000

Reexamination Certificate

active

07896168

ABSTRACT:
A filter block may comprise activated carbon filter particles without metallic biocides. The activated carbon filter particles may have a median particle size of less than or equal to about 90 microns and having a particle span of less than or equal to about 1.7. The filter block may have a permeability of greater than about 3.0×10−9cm2and a Filter Viruses Log Removal of greater than about 2 logs. A portion of the activated carbon filter particles may be coated with a cationic polymer. Another filter block may comprise mesoporous activated carbon filter particles without metallic biocides, wherein the mesoporous activated carbon filter particles may have a median particle size of less than or equal to about 104 μm and a particle span of less than or equal to about 2.05, and wherein at least a portion of the filter particles may be coated with a cationic polymer. The filter block may have a permeability of greater than about 2.0×10−9cm2and a Filter Viruses Log Removal of greater than about 2 logs.

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