Patent ID: 6478958
Filing Date: 2002-11-12
Classification: B01D,Y10S

Abstract:
A filter apparatus for removing impurities in a fluid comprising:a housing having a closed end and an open end, a full flow filter, said fill flow filter comprising an upstream side and a downstream side, with respect to fluid flow through said full flow filter, means for directing all of the fluid in said filter apparatus through said full flow filter, a bypass filter concentrically positioned within said full flow filter, said bypass filter comprising an upstream side and a downstream side, with respect to fluid flow through said bypass filter, a conduit positioned within said bypass filter, said conduit comprising a venturi, at least one aperture extending from a low pressure area within said venturi to a position adjacent a downstream side of the bypass filter, an upper end, and a lower end, wherein said lower end of the conduit comprises means defining a flow passage positioned proximate said downstream side of said full flow filter.