| 9124169 |
Autotransformer system reducing total harmonic distortion |
William S. Hammel |
2015-09-01 |
| 8444393 |
Rod pump control system including parameter estimator |
Thomas L. Beck, Ronald G. Peterson, Theresa Smigura |
2013-05-21 |
| 8384318 |
Induction motor torque control in a pumping system |
Thomas L. Beck, Michael Dry, Michael O. Lucas, Michael A. MacDonald, Ronald G. Peterson |
2013-02-26 |
| 8197219 |
Estimation and control of a resonant plant prone to stick-slip behavior |
— |
2012-06-12 |
| 8080950 |
Induction motor torque control in a pumping system |
Thomas L. Beck, Michael Dry, Michael O. Lucas, Michael A. MacDonald, Ronald G. Peterson |
2011-12-20 |
| 7786691 |
Bus disturbance regulator |
William S. Hammel |
2010-08-31 |
| 7645124 |
Estimation and control of a resonant plant prone to stick-slip behavior |
— |
2010-01-12 |
| 7545113 |
Harmonic disturbance regulator |
William S. Hammel, David R. Seidl |
2009-06-09 |
| 7437215 |
Method and system for improving pump efficiency and productivity under power disturbance conditions |
Robb G. Anderson, Harry W. Schulz |
2008-10-14 |
| 7168924 |
Rod pump control system including parameter estimator |
Thomas L. Beck, Ronald G. Peterson, Theresa Smigura |
2007-01-30 |