Filtering devices
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United States of America Patent
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Feb 14, 2006
Grant Date -
Aug 19, 2004
app pub date -
Aug 14, 2003
filing date -
Feb 13, 2003
priority date (Note) -
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Abstract
The invention provides a low-resistance gas adsorption filter provided with an activated carbon bed of bulk density less than 0.6 gram/cubic centimeter, the activated carbon bed being free of chromium 6+ salt, the filter being characterized by a gas holding capacity exceeding 300,000 milligram Dimethyl-methyl Phosphonate (DMMP)×minute/cubic meter and an airflow resistance such that the numerical value of air flow resistance in Pascal per millimeter of bed thickness does not exceed by more than 50% the numerical value of air velocity in centimeters per second.
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