Combination filter arrangement and method
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United States of America Patent
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Jul 31, 2012
Grant Date -
Feb 24, 2011
app pub date -
Jan 22, 2009
filing date -
Jan 24, 2008
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A cartridge type filter is mounted in a housing and is serviced through the top of the housing. The cartridge includes first and second media packs axially stacked. The second media pack is in series behind the first media pack, and filters a portion of the liquid therethrough. The second media pack has a higher efficiency than the first media pack. The overall design has a drain system which allows liquid to drain from the interior of the filter housing and back to the sump before the filter cartridge is completely removed from the housing. Other optional features include an oil cooler, various valving, and a filter cartridge lockout mechanism.
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