Gradient filtration apparatus
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Oct 26, 1999
Grant Date -
N/A
app pub date -
May 15, 1998
filing date -
May 16, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Particles such as bacteria may be enumerated from a liquid in an accurate and efficient manner through use of an apparatus including a filter sheet which is oriented transverse to the surface of the liquid being filtered. The filter sheet is so arranged so that, as the liquid is filtered, an increasing portion of the filter is above the surface of the liquid. As a result of the surface of the liquid dropping across the filter, a smaller fraction of the total volume of the liquid passes through the upper portion of the filter than through the lower portion of the filter. Since the number of bacteria trapped per unit area of the filter depends on the volume filtered through the area, a monotonically increasing gradient of density of filtered bacteria occurs from the top to the bottom of the filter.
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