A gravity cartridge filter for filtering fine particles from a fluid comprises a cartridge for disposition in a contaminated fluid tank. The cartridge comprises a plurality of layers that include a fluid passage in vertical juxtaposition with a filter medium, such as a mat, in each layer whereby gravity...http://www.google.es/patents/US5505861?utm_source=gb-gplus-sharePatente US5505861 - System for gravity settling of fine particles from a liquid
System for gravity settling of fine particles from a liquid
