Inventor · disambiguated record
Thomas J. Langenfeld
Also filed as: LANGENFELD THOMAS J
94 granted patents·1 pending application·1,234 citations·filing 1999–2024
99Inventor score
Files withHYDRO GEAR LTD PARTNERSHIP58HYDRO GEAR LP20LANGENFELD THOMAS J13BENNETT MICHAEL L1HYDRO GEAR LTD PARNTERSHIP1
Top patents by PatentIndex Score
95 records- 0199US10876596B1Electric motor with compound planetary gear driveHYDRO GEAR LP·Filed 2019·Granted Dec 29, 2020·19 cites·20 claims
- 0299US7134276B1Cylinder block brake for a hydrostatic drive apparatusHYDRO GEAR LTD PARTNERSHIP·Filed 2005·Granted Nov 14, 2006·64 cites·20 claims
- 0398US11346439B1Electric motor and gear assemblyHYDRO GEAR LP·Filed 2020·Granted May 31, 2022·10 cites·20 claims
- 0497US11235661B1Electric drive assemblyHYDRO GEAR LP·Filed 2020·Granted Feb 1, 2022·5 cites·17 claims
- 0597US8464610B1Drive deviceLANGENFELD THOMAS J·Filed 2009·Granted Jun 18, 2013·30 cites·15 claims
- 0696US6811509B1Hydraulic motor apparatus including brake mechanismHYDRO GEAR LTD PARTNERSHIP·Filed 2002·Granted Nov 2, 2004·49 cites·11 claims
- 0796US6672058B1Zero turn transaxleHYDRO GEAR LTD PARTNERSHIP·Filed 2003·Granted Jan 6, 2004·100 cites·30 claims
- 0895US8313408B1Drive assemblyLANGENFELD THOMAS J·Filed 2010·Granted Nov 20, 2012·23 cites·25 claims
- 0995US8245509B1Zero turn transaxleLANGENFELD THOMAS J·Filed 2010·Granted Aug 21, 2012·16 cites·22 claims
- 1095US7454908B1Zero turn transaxleHYDRO GEAR LTD PARTNERSHIP·Filed 2008·Granted Nov 25, 2008·18 cites·21 claims
- 1195US6701825B1Return to neutral device for a hydraulic apparatusHYDRO GEAR LTD PARTNERSHIP·Filed 2002·Granted Mar 9, 2004·62 cites·62 claims
- 1294US11338669B1Electric motor and gear assemblyHYDRO GEAR LP·Filed 2020·Granted May 24, 2022·3 cites·23 claims
- 1394US8931268B1Transaxle fluid expansion and contraction accommodation apparatusLANGENFELD THOMAS J·Filed 2011·Granted Jan 13, 2015·13 cites·23 claims
- 1494US8534060B1Drive deviceBENNETT MICHAEL L·Filed 2009·Granted Sep 17, 2013·24 cites·14 claims
- 1594US7367353B1Combined check valve and pressure relief valveHYDRO GEAR LTD PARTNERSHIP·Filed 2006·Granted May 6, 2008·24 cites·16 claims
- 1694US7225617B1Bypass mechanism for a hydraulic drive apparatusHYDRO GEAR LTD PARTNERSHIP·Filed 2006·Granted Jun 5, 2007·31 cites·19 claims
- 1794US7111545B1Return to neutral device for a hydraulic apparatusHYDRO GEAR LTD PARTNERSHIP·Filed 2005·Granted Sep 26, 2006·24 cites·25 claims
- 1894US6843056B1Zero turn transaxleHYDRO GEAR LTD PARTNERSHIP·Filed 2003·Granted Jan 18, 2005·55 cites·33 claims
- 1993US7841176B1Zero turn transaxleHYDRO GEAR LTD PARNTERSHIP·Filed 2008·Granted Nov 30, 2010·34 cites·15 claims
- 2093US6374604B1Hydrostatic transmission bypass latchHYDRO GEAR LTD PARTNERSHIP·Filed 2000·Granted Apr 23, 2002·30 cites·11 claims
- 2193US6370876B1Axle driving apparatus having an improved hydraulic fluid bypass mechanismHYDRO GEAR LTD PARTNERSHIP·Filed 2000·Granted Apr 16, 2002·28 cites·6 claims
- 2292US9163724B1Transaxle having dual brake systemHYDRO GEAR LTD PARTNERSHIP·Filed 2012·Granted Oct 20, 2015·7 cites·20 claims
- 2392US7927245B1Hydraulic motor apparatusHYDRO GEAR LTD PARTNERSHIP·Filed 2008·Granted Apr 19, 2011·14 cites·17 claims
- 2492US7926266B1Hydraulic drive apparatusHYDRO GEAR LTD PARTNERSHIP·Filed 2009·Granted Apr 19, 2011·10 cites·9 claims
- 2592US7308790B1Adjustable hydraulic motor apparatusHYDRO GEAR LTD PARTNERSHIP·Filed 2005·Granted Dec 18, 2007·28 cites·24 claims
- 2692US7028708B1Combined check valve and pressure relief valveHYDRO GEAR LTD PARTNERSHIP·Filed 2003·Granted Apr 18, 2006·35 cites·32 claims
- 2792US6964164B1Return to neutral device for a hydraulic apparatusHYDRO GEAR LTD PARTNERSHIP·Filed 2003·Granted Nov 15, 2005·27 cites·25 claims
- 2891US10451171B1Fluid expansion tankHYDRO GEAR LP·Filed 2016·Granted Oct 22, 2019·4 cites·23 claims
- 2991US8517159B1Brake actuation assemblyLANGENFELD THOMAS J·Filed 2011·Granted Aug 27, 2013·10 cites·23 claims
- 3091US6253637B1Control device for hydrostatic apparatusHYDRO GEAR LTD PARTNERSHIP·Filed 1999·Granted Jul 3, 2001·33 cites·16 claims
- 3190US10166864B1Drive apparatusHYDRO GEAR LP·Filed 2017·Granted Jan 1, 2019·3 cites·17 claims
- 3290US9976640B1Drive assemblyHYDRO GEAR LP·Filed 2015·Granted May 22, 2018·4 cites·20 claims
- 3390US9371842B1Hydraulic motor having a dual brake systemHYDRO GEAR LTD PARTNERSHIP·Filed 2012·Granted Jun 21, 2016·8 cites·24 claims
- 3489US9109684B1Drive deviceHYDRO GEAR LTD PARTNERSHIP·Filed 2013·Granted Aug 18, 2015·6 cites·20 claims
- 3589US7568497B1Combined check valve and pressure relief valveHYDRO GEAR LTD PARTNERSHIP·Filed 2008·Granted Aug 4, 2009·14 cites·20 claims
- 3689US7127889B1Zero turn transaxleHYDRO GEAR LTD PARTNERSSHIP·Filed 2005·Granted Oct 31, 2006·35 cites·20 claims
- 3789US7047736B1Zero turn transaxleHYDRO GEAR LTD PARTNERSHIP·Filed 2004·Granted May 23, 2006·25 cites·20 claims
- 3888US9598103B1Steerable transaxleHYDRO-GEAR LTD PARTNERSHIP·Filed 2014·Granted Mar 21, 2017·10 cites·22 claims
- 3988US8820066B1Steerable transaxleLANGENFELD THOMAS J·Filed 2010·Granted Sep 2, 2014·8 cites·24 claims
- 4088US6811510B1Hydraulic motor apparatus and vehicleHYDRO GEAR LTD PARTNERSHIP·Filed 2002·Granted Nov 2, 2004·40 cites·16 claims
- 4187US9469191B1Transaxle fluid expansion and contraction accommodation apparatusHYDRO-GEAR LTD PARTNERSHIP·Filed 2015·Granted Oct 18, 2016·3 cites·20 claims
- 4287US8057335B1Brake actuation assemblyLANGENFELD THOMAS J·Filed 2008·Granted Nov 15, 2011·11 cites·11 claims
- 4387US8001883B1Return to neutral device for a hydraulic apparatusHYDRO GEAR LTD PARTNERSHIP·Filed 2008·Granted Aug 23, 2011·12 cites·25 claims
- 4487US7412828B1Adjustable hydraulic motor apparatusHYDRO GEAR LTD PARTNERSHIP·Filed 2007·Granted Aug 19, 2008·14 cites·21 claims
- 4587US7210294B1Hydrostatic transaxleHYDRO GEAR LTD PARTNERSHIP·Filed 2005·Granted May 1, 2007·12 cites·20 claims
- 4686US8919116B1Variable drive apparatusHYDRO GEAR LTD PARTNERSHIP·Filed 2014·Granted Dec 30, 2014·3 cites·22 claims
- 4786US8235858B1Gear driveLANGENFELD THOMAS J·Filed 2010·Granted Aug 7, 2012·6 cites·19 claims
- 4886US8132588B1ValveLANGENFELD THOMAS J·Filed 2008·Granted Mar 13, 2012·13 cites·8 claims
- 4986US7487636B1Hydraulic drive apparatusHYDRO GEAR LTD PARTNERSHIP·Filed 2006·Granted Feb 10, 2009·6 cites·20 claims
- 5085US7328576B1Zero turn transaxleHYDRO GEAR LTD PARTNERSHIP·Filed 2007·Granted Feb 12, 2008·21 cites·20 claims
Showing the top 50 of 95 patent records by PatentIndex Score.
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →