Patent ID: 8460424

Claim:
A crankcase ventilation filter including: (a) a first, wet laid, media stage comprising: (i) at least 30% by weight, based on total weight of fiber material in the stage, bi-component fiber material having an average largest fiber cross-sectional dimension of at least 10 microns and average length of 1-20 mm, inclusive; and (ii) at least 30% by weight, based on total weight of fiber material in the stage, secondary fiber material intermixed with the bi-component fiber material, the secondary fiber material having an average largest fiber cross-sectional dimension of at least 1 micron and average length of 1 to 20 mm, inclusive; and (b) the first, wet laid, media stage having: (i) an added binder resin content, if any, of no greater than 7% by total weight of fiber material.