Submicron disc filters
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United States of America Patent
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Sep 27, 1988
Grant Date -
N/A
app pub date -
Oct 31, 1986
filing date -
Nov 1, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A precision filter for accomplishing filtering of precision of submicron order. A filter element of the filter consists of a plurality of superposed disc-shaped annular support members for filter membranes. Each support member has a radially outwardly extending intermediate section located between an annular boss section and an outer frame section. The intermediate section is formed on its upper and lower sides with a plurality of gently winding elongate ridges and largely winding elongate ridges. Each largely winding elongate ridge extends from the boss section to the outer frame section, but each gently winding elongate ridge located between the two largely winding elongate ridges is separate from the boss section thereby to form two elongate winding grooves which are joined and continuous to a central opening of the boss section. The thus formed support member intermediate section is sealingly covered with the filter membrane so that filtrate flows along the elongate winding grooves to reach the boss section central opening.
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