Patent ID: 8177875

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 having an average largest fiber cross-sectional dimension of at least 1 micron and average length of 1 to 20 mm, inclusive, (b) the first, wet laid, media stage having (i) calculated pore size, X-Y direction, of 12 to 50 microns, inclusive; and (ii) an added binder resin content, if any, of no greater than 7% by total weight of fiber material; and (iii) a tubular construction.