US7174273B2 - Filter monitoring system - Google Patents
Kevin Gibbons: Wash filter with wash velocity control cone US7922914B1 (en) 2007-08-23: 2011-04-12: Cummins Filtration Ip, Inc. Methods and systems for monitoring characteristics in a fluid flow path having a filter for filtering fluid in the path US20110185895A1 (en) * 2010-02-03: 2011-08-04: Paul Freen