A filter apparatus includes a fluted filter element in a filter housing having a first open end and a second closed end. The filter element includes fluted filter media coiled into a cylindrical shape and may include an end cap for support and fluid control. Fluid flows into the open end and either around...http://www.google.fr/patents/US5895574?utm_source=gb-gplus-shareBrevet US5895574 - Rolled liquid filter using fluted media
