Inventor
WAHLQUIST FRED H
US26 patents
⚠️ This page may combine multiple inventors who share the name “WAHLQUIST FRED H”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
DONALDSON CO INC
21 patentsUS5902364AMay 11, 1999
Conical filter
DONALDSON CO INC506 citations99
US5820646AOct 13, 1998
Inline filter apparatus
DONALDSON CO INC798 citations99
US5772883AJun 30, 1998
Slanted inline filter
DONALDSON CO INC465 citations99
US5575826ANov 19, 1996
Air cleaner
DONALDSON CO INC153 citations99
US7329326B2Feb 12, 2008
Method of making a fluted filter media for air filter
DONALDSON CO INC138 citations98
US7090711B2Aug 15, 2006
Multistage air cleaner including pulse cleaning system
DONALDSON CO INC141 citations98
US6908494B2Jun 21, 2005
Multistage air cleaner including pulse cleaning system
DONALDSON CO INC109 citations98
US6676721B1Jan 13, 2004
Multistage air cleaner including pulse cleaning system
DONALDSON CO INC151 citations98
US5895574AApr 20, 1999
Rolled liquid filter using fluted media
DONALDSON CO INC449 citations98
US5683479ANov 4, 1997
Air cleaner having scavenger arrangement
DONALDSON CO INC63 citations96
US5401285AMar 28, 1995
Air cleaner having scavenger arrangement for precleaner and filter thereof
DONALDSON CO INC83 citations96
US4504293AMar 12, 1985
Self-cleaning air filter
DONALDSON CO INC98 citations96
US4452616AJun 5, 1984
Self-cleaning air cleaner
DONALDSON CO INC119 citations96
US6872237B2Mar 29, 2005
Multistage air cleaner including pulse cleaning system
DONALDSON CO INC45 citations95
US6009898AJan 4, 2000
Valve assembly for preventing liquid ingestion and methods
DONALDSON CO INC21 citations92
US5116083AMay 26, 1992
Clamp for coupling and sealing pipe joints
DONALDSON CO INC16 citations74
US6213146B1Apr 10, 2001
Valve assembly for preventing liquid ingestion and methods
DONALDSON CO INC6 citations73
US6209559B1Apr 3, 2001
Valve assembly for preventing liquid ingestion and methods
DONALDSON CO INC6 citations73
US11731072B2Aug 22, 2023
Pulse ring assembly for air cleaner systems and methods thereof
DONALDSON CO INC2 citations71
US9737837B2Aug 22, 2017
Pulse jet air cleaner systems; evacuation valve arrangements; air cleaner components; and, methods
DONALDSON CO INC3 citations70
US12239934B2Mar 4, 2025
Pulse ring assembly for air cleaner systems and methods thereof
DONALDSON CO INC0 citations61