Inventor
ENGEL DONALD F
US20 patents
⚠️ This page may combine multiple inventors who share the name “ENGEL DONALD F”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
DONALDSON CO INC
18 patentsUS5613992AMar 25, 1997
Reverse flow air filter arrangement and method
DONALDSON CO INC434 citations99
US4720292AJan 19, 1988
Cylindrical air filter with lightweight housing and radially directed seal
DONALDSON CO INC405 citations99
US7905936B2Mar 15, 2011
Filter arrangements; housing; assemblies; and, methods
DONALDSON CO INC126 citations98
US7655074B2Feb 2, 2010
Filter arrangements; side-entry housings; and methods
DONALDSON CO INC154 citations98
US7396375B2Jul 8, 2008
Air filter having fluted filter media
DONALDSON CO INC237 citations98
US7981183B2Jul 19, 2011
Filter arrangements; side-entry housings; and methods
DONALDSON CO INC108 citations97
US7635403B2Dec 22, 2009
Air filter having fluted filter media
DONALDSON CO INC28 citations96
US5123795AJun 23, 1992
Quarter turn fastener
DONALDSON CO INC74 citations96
US9162172B2Oct 20, 2015
Air filter having fluted filter media
DONALDSON CO INC20 citations92
US8343245B2Jan 1, 2013
Filter arrangements; housings; assemblies; and, methods
DONALDSON CO INC27 citations92
US5129685AJul 14, 1992
Connector system for air transfer ducts
DONALDSON CO INC53 citations92
US9782713B2Oct 10, 2017
Air filter having fluted filter media
DONALDSON CO INC6 citations84
US4974881ADec 4, 1990
Air transfer system
DONALDSON CO INC19 citations82
US5137308AAug 11, 1992
Air transfer system
DONALDSON CO INC13 citations74
US4856826AAug 15, 1989
Air transfer system
DONALDSON CO INC15 citations74
US4699639AOct 13, 1987
Air-intake, moisture-eliminator duct apparatus
DONALDSON CO INC15 citations74
US11185810B2Nov 30, 2021
Air filter having fluted filter media
DONALDSON CO INC1 citations73
US10556202B2Feb 11, 2020
Air filter having fluted filter media
DONALDSON CO INC2 citations73