David M. Messersmith
24Patents
6h-index
18Co-inventors
66Inventor score
Filing activity: Oct 18, 1989 → Jun 21, 2023
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6803741B2 | Motor controller | Electricity | 18 | Expired |
| US7227326B1 | System and method for transient-based motor speed estimation with transient excitation | Electricity | 16 | Expired |
| US4990844A | DC braking of inverter-driven AC motors | Electricity | 15 | Expired |
| US6076805A | Rope pulling device | Performing Operations; Transporting | 9 | Expired |
| US7538507B2 | System and method for transient-based motor speed estimation with transient excitation | Electricity | 9 | Active |
| US5461296A | Bumpless rotating start | Electricity | 8 | Expired |
| US8203304B2 | Control method and system with feedback indicative of load flux | Electricity | 5 | Active |
| US8742767B2 | Parameter estimation system and method for an induction motor | Electricity | 4 | Active |
| US8138709B2 | Control method and system | Electricity | 4 | Active |
| US8519662B2 | Method and apparatus for controlling motor torque | Electricity | 4 | Active |
| US9685898B2 | Quasi vector motor controller | Electricity | 3 | Active |
| US9880223B2 | Parameter estimation system and method for an induction motor | Electricity | 3 | Active |
| US9350275B2 | Quasi variable frequency motor controller | Electricity | 2 | Active |
| US8547050B2 | Control method and system with feedback indicative of load flux | Electricity | 1 | Active |
| US11114842B1 | Dual PWM relay driver with diagnostics for functional safety system | Physics | 1 | Active |
| US7672096B2 | Switching apparatus and method | Electricity | 1 | Active |
| US10958062B2 | Systems and methods for dynamically switching a load of a current transformer circuit | Physics | 0 | Active |
| US11830693B2 | Predicting zero-crossings for point-on-wave (POW) switching techniques | Electricity | 0 | Active |
| US12422484B2 | Detecting welded relay contacts using electrical pulse | Physics | 0 | Active |
| US11901145B2 | Systems and methods for detecting welded contacts in an electromagnetic switch system | Electricity | 0 | Active |
| US12347636B2 | Systems and methods for detecting welded contacts in a switch system | Electricity | 0 | Active |
| US9518570B2 | Motor winding heater systems and methods | Electricity | 0 | Active |
| US12416672B2 | Detecting welded relay contacts using contact close time measurement | Electricity | 0 | Active |
| US11676786B2 | Systems and methods for controlling contactor open time | Electricity | 0 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.