Gas separation – Plural serial basically diverse separating media – Plural stages in unitary casing
Patent
1993-04-12
1993-10-05
Brown, David H.
Gas separation
Plural serial basically diverse separating media
Plural stages in unitary casing
55522, B01D 2400, B01D 5000
Patent
active
H00012408
ABSTRACT:
A low profile chemical biological air filter, comprising a frame having a rst end for attachment to a mask and having an upwardly facing surface defining an inlet for the filter. The frame has a length sufficient to space first and second filters from the inlet to the attachment first end and a width sufficient to enclose the two filters. Its thickness is no greater than that necessary to contain only one of the two filters to minimize the thickness of the frame by placing the two filters side by side. The filters include a HEPA filter for removing particulate material from the air and a Whetlerized charcoal filter bed for secondary filtering of the air. The HEPA filter is supported in the frame at the inlet as is the charcoal filter bed along with a fines filter for protecting from dust which may be dislodged from the charcoal filter bed. The frame has a flexible hollow connector made from bromobutyl rubber or other applicable material for defining an air flow path sequentially from the inlet through the HEPA filter through the charcoal filter bed to the attachment first end. A sealant is provided to hold the HEPA filter in place. Also provided is a retainer for supporting the HEPA filter and charcoal filter bed constructed from plastic or aluminum and having a shape similar to one-sixteenth mesh screen.
Grove Corey M.
Tardiff, Jr. Albert N.
Brown David H.
Goldberg Edward
Lane Anthony T.
Sachs Michael
The United States of America as represented by the Secretary of
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