A biological particle filter has an upper body with an interior chamber for receiving a suspension to be filtered, the upper body having a central axis and a lower end with a bottom surface lying in a tilted plane forming an angle of between about 75.degree. and about 85.degree. with the central axis....http://www.google.com/patents/US5861094?utm_source=gb-gplus-sharePatent US5861094 - Filter for biological particle separation
