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US 6,274,035 B1Granted
Biological filtration using parallel sheets
OwnerSidney W. K. Yuan, Katherine K. Yuan +2inventors
InventorsSidney W. K. Yuan, Katherine K. Yuan, Jacquelyn K. Yuan, Chrystal S. Yuan
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Abstract
This invention relates to compact, high efficiency filter medium for used in biological filters. Thin filter sheets provide large surface area for the colonization of bacteria. Stacking the filter sheets in layers or rolling the sheet upon itself produce uniform flow passages defined by the spacers on the filter sheets which prevent fluid from flowing through a few large passages and thus reducing the efficiency of the entire filter.
Claims21
A biological filter medium comprising:
- a stack of adjacent generally parallel sheets made of one-piece homogenous material of non-uniform thickness, with a plurality of solid thick portions of the sheets acting as spacers, separating the thin portions of the adjacent sheets allowing fluid to pass only through in-between adjacent sheets.
Dependencies are inferred from the claim text.