Inventor · disambiguated record
Fred H. Wahlquist
Also filed as: WAHLQUIST FRED · WAHLQUIST FRED H
35 granted patents·2 pending applications·3,552 citations·filing 1982–2023
98Inventor score
Files withDONALDSON CO INC28GILLINGHAM GARY R3WAGNER WAYNE M2FEDDERSEN TERRANCE D1GILLINGHAM GARY RAY1
Top patents by PatentIndex Score
37 records- 0199US5902364AConical filterDONALDSON CO INC·Filed 1996·Granted May 11, 1999·506 cites·27 claims
- 0299US5820646AInline filter apparatusDONALDSON CO INC·Filed 1996·Granted Oct 13, 1998·798 cites·28 claims
- 0399US5772883ASlanted inline filterDONALDSON CO INC·Filed 1996·Granted Jun 30, 1998·465 cites·30 claims
- 0498US7090711B2Multistage air cleaner including pulse cleaning systemDONALDSON CO INC·Filed 2005·Granted Aug 15, 2006·141 cites·19 claims
- 0598US6676721B1Multistage air cleaner including pulse cleaning systemDONALDSON CO INC·Filed 2000·Granted Jan 13, 2004·151 cites·22 claims
- 0698US5895574ARolled liquid filter using fluted mediaDONALDSON CO INC·Filed 1996·Granted Apr 20, 1999·449 cites·8 claims
- 0797US7329326B2Method of making a fluted filter media for air filterDONALDSON CO INC·Filed 2003·Granted Feb 12, 2008·138 cites·9 claims
- 0897US6908494B2Multistage air cleaner including pulse cleaning systemDONALDSON CO INC·Filed 2004·Granted Jun 21, 2005·109 cites·20 claims
- 0997US5575826AAir cleanerDONALDSON CO INC·Filed 1995·Granted Nov 19, 1996·153 cites·19 claims
- 1097US4452616ASelf-cleaning air cleanerDONALDSON CO INC·Filed 1982·Granted Jun 5, 1984·119 cites·9 claims
- 1196US9108135B2Pulse jet air cleaner systems; components; and, methodsDONALDSON CO INC·Filed 2013·Granted Aug 18, 2015·21 cites·26 claims
- 1296US8460442B2Fluted filter mediaWAGNER WAYNE M·Filed 2012·Granted Jun 11, 2013·25 cites·10 claims
- 1395US4504293ASelf-cleaning air filterDONALDSON CO INC·Filed 1983·Granted Mar 12, 1985·98 cites·8 claims
- 1494US9757673B2Pulse jet air cleaner systems, components, and, methodsDONALDSON CO INC·Filed 2015·Granted Sep 12, 2017·6 cites·14 claims
- 1594US8404021B2Pulse jet air cleaner system; components; and, methodsGILLINGHAM GARY R·Filed 2007·Granted Mar 26, 2013·30 cites·19 claims
- 1694US5401285AAir cleaner having scavenger arrangement for precleaner and filter thereofDONALDSON CO INC·Filed 1993·Granted Mar 28, 1995·83 cites·8 claims
- 1793US6872237B2Multistage air cleaner including pulse cleaning systemDONALDSON CO INC·Filed 2004·Granted Mar 29, 2005·45 cites·17 claims
- 1892US10512870B2Pulse jet air cleaner systems, components, and, methodsDONALDSON CO INC·Filed 2017·Granted Dec 24, 2019·4 cites·20 claims
- 1992US7927396B2Evacuation value arrangements; pulse jet air cleaner systems using same; and, methodDONALDSON CO INC·Filed 2009·Granted Apr 19, 2011·22 cites·26 claims
- 2090US9186612B2Pulse jet air cleaner systems; evacuation valve arrangements; air cleaner components; and, methodsWAHLQUIST FRED·Filed 2011·Granted Nov 17, 2015·17 cites·15 claims
- 2190US8268053B2Fluted filter mediaWAGNER WAYNE M·Filed 2008·Granted Sep 18, 2012·18 cites·5 claims
- 2288US10967320B2Pulse jet air cleaner systems; components; and, methodsDONALDSON CO INC·Filed 2019·Granted Apr 6, 2021·2 cites·27 claims
- 2388US8262762B2Evacuation valve arrangements; pulse jet air cleaner systems using same; and, methodsOLSON THOMAS·Filed 2011·Granted Sep 11, 2012·12 cites·23 claims
- 2488US5683479AAir cleaner having scavenger arrangementDONALDSON CO INC·Filed 1996·Granted Nov 4, 1997·63 cites·19 claims
- 2587US9737837B2Pulse jet air cleaner systems; evacuation valve arrangements; air cleaner components; and, methodsDONALDSON CO INC·Filed 2015·Granted Aug 22, 2017·3 cites·15 claims
- 2685US10675578B2Pulse jet air cleaner systems; evacuation valve arrangements; air cleaner components; and, methodsDONALDSON CO INC·Filed 2017·Granted Jun 9, 2020·2 cites·15 claims
- 2784US11731072B2Pulse ring assembly for air cleaner systems and methods thereofDONALDSON CO INC·Filed 2019·Granted Aug 22, 2023·2 cites·20 claims
- 2884US8951321B2Pulse jet air cleaner components; features; assemblies; and, methodsGILLINGHAM GARY RAY·Filed 2006·Granted Feb 10, 2015·15 cites·14 claims
- 2980US8444748B2Multistage air cleaner including pulse cleaning systemGILLINGHAM GARY R·Filed 2007·Granted May 21, 2013·6 cites·22 claims
- 3077US12239934B2Pulse ring assembly for air cleaner systems and methods thereofDONALDSON CO INC·Filed 2023·Granted Mar 4, 2025·0 cites·20 claims
- 3172US11826691B2Pulse jet air cleaner systems; evacuation valve arrangements; air cleaner components; and, methodsDONALDSON CO INC·Filed 2020·Granted Nov 28, 2023·0 cites·23 claims
- 3269US6009898AValve assembly for preventing liquid ingestion and methodsDONALDSON CO INC·Filed 1998·Granted Jan 4, 2000·21 cites·20 claims
- 3353US2006277871A1Multistage air cleaner including pulse cleaning systemGILLINGHAM GARY R·Filed 2006·Application pending·0 cites
- 3448US5116083AClamp for coupling and sealing pipe jointsDONALDSON CO INC·Filed 1990·Granted May 26, 1992·16 cites·8 claims
- 3544US2009229458A1Filter element arrangement including bypass arrangement and methodsFEDDERSEN TERRANCE D·Filed 2008·Application pending·0 cites
- 3642US6209559B1Valve assembly for preventing liquid ingestion and methodsDONALDSON CO INC·Filed 1999·Granted Apr 3, 2001·6 cites·9 claims
- 3741US6213146B1Valve assembly for preventing liquid ingestion and methodsDONALDSON CO INC·Filed 1999·Granted Apr 10, 2001·6 cites·20 claims
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