Multi-stage vent filter
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United States of America Patent
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Apr 6, 1999
Grant Date -
N/A
app pub date -
Aug 20, 1997
filing date -
Aug 20, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A vent filter assembly for use with containers containing hazardous chemical or radioactive waste, the assembly having a first stage attached to the container having a first filter media, preferably sintered steel, which allows unaltered passage of pure gas but which blocks passage of particulate matter, and a second stage removably attached to the first stage, the second stage allowing passage of gas but blocking passage of particulate matter and volatile organic solvents. Removal of the second stage from the first stage allows a pure sample of gas to be drawn through the first stage, whereupon the second stage can be reattached to the first stage to provide the required filtering of volatile organic solvents.
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