Microporous paper filter for particulates
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United States of America Patent
Stats
-
May 15, 2007
Grant Date -
Nov 18, 2004
app pub date -
May 10, 2004
filing date -
May 13, 2003
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A microporous paper filter (10) for particulates emitted together with the exhaust gases of internal combustion engines, made in the form of a folded up sheet to form a 'Greek key' i.e. having several filtering layers (13) placed substantially parallel, connected by means of folds (14), the layers (13) being separated and maintained equidistant through the interposition of spacers (20) each comprising at least one corrugated paper sheet (21, 22) or pleated paper (23).
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