Issued Patents All Time
Showing 26–50 of 50 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10513413 | PWM strategy for regenerative multilevel drive | Shashank Krishnamurthy, Prasanna Nagarajan, HanJong Kim, Yang Wang | 2019-12-24 |
| 10454387 | Interposition inductor arrangement for multiple drives in parallel | HanJong Kim | 2019-10-22 |
| 10381968 | Converter pulse width modulation strategies for three phase regenerative drives | — | 2019-08-13 |
| 10343872 | Elevator system having battery and energy storage device | Carlo Mezzadri | 2019-07-09 |
| 10287131 | Elevator drive control to protect drive components from moisture | Prasanna Nagarajan | 2019-05-14 |
| 10273119 | Elevator load weighing system | James L. Hubbard, Takashi Onodera | 2019-04-30 |
| 10246294 | Bus capacitor bank configuration for a regenerative drive | Steven M. Millett, HanJong Kim | 2019-04-02 |
| 10221038 | Control strategies for multilevel line regenerative drive | Yang Wang, Shashank Krishnamurthy | 2019-03-05 |
| 10218262 | Hybrid direct current link system for a regenerative drive | — | 2019-02-26 |
| 10099894 | Active damping of a hovering elevator car based on vertical oscillation of the hovering elevator car | Randall Keith Roberts, Amir Lotfi | 2018-10-16 |
| 10059563 | Elevator car speed control in a battery powered elevator system | — | 2018-08-28 |
| 10008917 | Bus capacitor bank configuration for a multi-level regenerative drive | Steven M. Millett, Shashank Krishnamurthy, Yang Wang | 2018-06-26 |
| 9957131 | Elevator speed control | Edward Piedra | 2018-05-01 |
| 9906183 | Parallel interleaved 2-level or 3-level regenerative drives | — | 2018-02-27 |
| 9815665 | Battery mounting in elevator hoistway | Kyle W. Rogers, Daryl J. Marvin, David J. Lanesey, Bassel Al-Annouf, HanJong Kim | 2017-11-14 |
| 9586789 | Elevator braking in a battery powered elevator system | Daryl J. Marvin | 2017-03-07 |
| 9511976 | Position feedback for elevator system | Keunmo Kang, Timothy D. DeValve, William A. Veronesi, Slade R. Culp, Harold Terry +1 more | 2016-12-06 |
| 8789659 | System and method for operating a motor during normal and power failure conditions | Vladimir Blasko, Frank Higgins | 2014-07-29 |
| 8629637 | Operation of a three-phase regenerative drive from mixed DC and single phase AC power sources | Vladimir Blasko, Stella M. Oggianu, Robert K. Thornton | 2014-01-14 |
| 8230978 | Elevator regenerative drive with automatic rescue operation | Vladimir Blasko, Frank Higgins | 2012-07-31 |
| 8127894 | Elevator motor drive tolerant of an irregular power source | Christopher S. Czerwinski, Jeffrey M. Izard, Edward Piedra, Vladimir Blasko, Frank Higgins +1 more | 2012-03-06 |
| 8006808 | Managing an encoder malfunction in an elevator drive system | Edward Piedra, Jeffrey M. Izard | 2011-08-30 |
| 7609534 | Operating a three phase device using single phase power | Vladimir Blasko, Christopher S. Czerwinski | 2009-10-27 |
| 6492788 | Method and apparatus for encoderless operation of a permanent magnet synchronous motor in an elevator | Aleksandar M. Stankovic, Chris Czerwinski, Ed Piedra | 2002-12-10 |
| 6459599 | Determining phase of AC mains in PWM controlled converters without voltage sensors | Vladimir Blasko, Christopher S. Czerwinski, Jeffrey M. Izard, Edward Piedra | 2002-10-01 |