Inventor · disambiguated record
David M. Messersmith
Also filed as: MESSERSMITH DAVID · MESSERSMITH DAVID M
25 granted patents·1 pending application·170 citations·filing 1989–2023
95Inventor score
Top patents by PatentIndex Score
26 records- 0197US11114842B1Dual PWM relay driver with diagnostics for functional safety systemROCKWELL AUTOMATION TECH INC·Filed 2020·Granted Sep 7, 2021·8 cites·20 claims
- 0293US7227326B1System and method for transient-based motor speed estimation with transient excitationROCKWELL AUTOMATION TECH INC·Filed 2006·Granted Jun 5, 2007·30 cites·34 claims
- 0383US8519662B2Method and apparatus for controlling motor torqueLU HAIHUI·Filed 2010·Granted Aug 27, 2013·6 cites·16 claims
- 0482US9880223B2Parameter estimation system and method for an induction motorROCKWELL AUTOMATION TECH INC·Filed 2014·Granted Jan 30, 2018·4 cites·20 claims
- 0581US9685898B2Quasi vector motor controllerROCKWELL AUTOMATION TECH INC·Filed 2014·Granted Jun 20, 2017·4 cites·20 claims
- 0679US7538507B2System and method for transient-based motor speed estimation with transient excitationROCKWELL INTERNAT TECHNOLOGIES·Filed 2007·Granted May 26, 2009·13 cites·16 claims
- 0777US8742767B2Parameter estimation system and method for an induction motorMESSERSMITH DAVID M·Filed 2009·Granted Jun 3, 2014·8 cites·20 claims
- 0877US6803741B2Motor controllerROCKWELL AUTOMATION TECH INC·Filed 2002·Granted Oct 12, 2004·24 cites·29 claims
- 0974US4990844ADC braking of inverter-driven AC motorsEATON CORP·Filed 1989·Granted Feb 5, 1991·27 cites·4 claims
- 1071US8203304B2Control method and system with feedback indicative of load fluxLU HAIHUI·Filed 2007·Granted Jun 19, 2012·7 cites·16 claims
- 1170US9350275B2Quasi variable frequency motor controllerROCKWELL AUTOMATION TECH INC·Filed 2014·Granted May 24, 2016·2 cites·22 claims
- 1266US12416672B2Detecting welded relay contacts using contact close time measurementROCKWELL AUTOMATION TECH INC·Filed 2023·Granted Sep 16, 2025·0 cites·20 claims
- 1364US12461156B2Detecting welded relay contacts using spanner voltage measurementROCKWELL AUTOMATION TECH INC·Filed 2023·Granted Nov 4, 2025·0 cites·20 claims
- 1461US8547050B2Control method and system with feedback indicative of load fluxLU HAIHUI·Filed 2012·Granted Oct 1, 2013·1 cites·13 claims
- 1560US12422484B2Detecting welded relay contacts using electrical pulseROCKWELL AUTOMATION TECH INC·Filed 2023·Granted Sep 23, 2025·0 cites·20 claims
- 1660US9518570B2Motor winding heater systems and methodsMESSERSMITH DAVID·Filed 2012·Granted Dec 13, 2016·1 cites·15 claims
- 1759US11676786B2Systems and methods for controlling contactor open timeROCKWELL AUTOMATION TECH INC·Filed 2020·Granted Jun 13, 2023·0 cites·20 claims
- 1859US8138709B2Control method and systemMESSERSMITH DAVID M·Filed 2007·Granted Mar 20, 2012·4 cites·20 claims
- 1958US11830693B2Predicting zero-crossings for point-on-wave (POW) switching techniquesROCKWELL AUTOMATION TECH INC·Filed 2021·Granted Nov 28, 2023·0 cites·20 claims
- 2058US5461296ABumpless rotating startEATON CORP·Filed 1993·Granted Oct 24, 1995·19 cites·9 claims
- 2157US11901145B2Systems and methods for detecting welded contacts in an electromagnetic switch systemROCKWELL AUTOMATION TECH INC·Filed 2021·Granted Feb 13, 2024·0 cites·20 claims
- 2256US12347636B2Systems and methods for detecting welded contacts in a switch systemROCKWELL AUTOMATION TECH INC·Filed 2022·Granted Jul 1, 2025·0 cites·19 claims
- 2356US7672096B2Switching apparatus and methodROCKWELL AUTOMATION TECH INC·Filed 2006·Granted Mar 2, 2010·2 cites·25 claims
- 2456US2024426913A1Detecting welded relay contacts using measurement after current breakROCKWELL AUTOMATION TECH INC·Filed 2023·Application pending·0 cites
- 2547US10958062B2Systems and methods for dynamically switching a load of a current transformer circuitROCKWELL AUTOMATION TECH INC·Filed 2018·Granted Mar 23, 2021·0 cites·19 claims
- 2645US6076805ARope pulling deviceFiled 1999·Granted Jun 20, 2000·10 cites·3 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →