Issued Patents All Time
Showing 26–38 of 38 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8259474 | Pulse width modulation control of a matrix converter | — | 2012-09-04 |
| 8230978 | Elevator regenerative drive with automatic rescue operation | Ismail Agirman, Frank Higgins | 2012-07-31 |
| 8146714 | Elevator system including regenerative drive and rescue operation circuit for normal and power failure conditions | — | 2012-04-03 |
| 8127894 | Elevator motor drive tolerant of an irregular power source | Ismail Agirman, Christopher S. Czerwinski, Jeffrey M. Izard, Edward Piedra, Frank Higgins +1 more | 2012-03-06 |
| 7609534 | Operating a three phase device using single phase power | Ismail Agirman, Christopher S. Czerwinski | 2009-10-27 |
| 6636693 | DC motor matrix converter with field and armature circuits | — | 2003-10-21 |
| 6459599 | Determining phase of AC mains in PWM controlled converters without voltage sensors | Ismail Agirman, Christopher S. Czerwinski, Jeffrey M. Izard, Edward Piedra | 2002-10-01 |
| 5905644 | DC bus voltage controller | Vikram Kaura | 1999-05-18 |
| 5706186 | Hybrid pulse width modulation method and apparatus | — | 1998-01-06 |
| 5619114 | Signal averager for use with motor controller | — | 1997-04-08 |
| 5610806 | Pulse width modulation method for driving three phase power inverter/converter switches with balanced discontinuous phase commands | Vikram Kaura | 1997-03-11 |
| 5206802 | Blanking interval voltage deviation compensator for inverters and converters | — | 1993-04-27 |
| 5153821 | Pulse-width-modulation method for providing extended linearity, reduced commutation losses and increase in inverter/converter output voltage | — | 1992-10-06 |