Transmission filter felt
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United States of America Patent
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Feb 24, 2004
Issued Date -
N/A
app pub date -
Aug 20, 2002
filing date -
May 27, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A transmission fluid filter material and transmission filter produced therefrom comprising a gradient density composite felt which exhibits high particle removal efficiency at 40 micron diameter particle size and larger with exceptionally high dirt holding capacity and no significant increase in clean pressure drop. The upstream portion of the composite felt contains fine fibers that selectively remove first the fine particles while the downstream portion acts to sieve coarse particles and build a porous filter cake, thereby extending the useful life of the filter.
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