A rotary filtration apparatus for separating a selected material suspended in a fluid, the apparatus comprising a housing having a selected axis of rotation, the housing being rotatably mounted on a rotation device which rotates the housing about the selected axis of rotation of the housing; the housing...http://www.google.com/patents/US5431814?utm_source=gb-gplus-sharePatent US5431814 - Centrifugal filter apparatus and method
