Issued Patents All Time
Showing 1–16 of 16 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11548758 | Health monitoring systems and methods for elevator systems | Randy Roberts, Bruce P. Swaybill | 2023-01-10 |
| 11235948 | Dynamic compensation control for elevator systems | Randy Roberts, David Ginsberg, Ronnie E. Thebeau, Konda Reddy Chevva, XiaoBin Tang | 2022-02-01 |
| 11078049 | Elevator system including a permanent magnet (PM) synchronous motor drive system | — | 2021-08-03 |
| 11014778 | Rescue control and method of operating an elevator system including a permanent magnet (PM) synchronous motor drive system | Prasanna Nagarajan | 2021-05-25 |
| 10822197 | Elevator run profile modification for smooth rescue | — | 2020-11-03 |
| 10538412 | Brake operation management in elevators | Amir Lotfi, Randall Keith Roberts, Ronnie E. Thebeau, Michael Garfinkel, Dennis Hanvey +1 more | 2020-01-21 |
| 10513414 | System and method of maintaining performance of a system | Yang Wang, HanJong Kim, Christopher S. Czerwinski, Shashank Krishnamurthy, Draguna Vrabie +1 more | 2019-12-24 |
| 10252879 | Brake operation management in elevators | Amir Lotfi, Randall Keith Roberts, Ronnie E. Thebeau, Michael Garfinkel, Dennis Hanvey +1 more | 2019-04-09 |
| 9957131 | Elevator speed control | Ismail Agirman | 2018-05-01 |
| 9862568 | Elevator run profile modification for smooth rescue | — | 2018-01-09 |
| 9809418 | Advanced smooth rescue operation | Prasanna Nagarajan, Amir Lotfi | 2017-11-07 |
| 8127894 | Elevator motor drive tolerant of an irregular power source | Ismail Agirman, Christopher S. Czerwinski, Jeffrey M. Izard, Vladimir Blasko, Frank Higgins +1 more | 2012-03-06 |
| 8104584 | Elevator drive control strategy | Ismail Agiman, Daryl J. Marvin | 2012-01-31 |
| 8006808 | Managing an encoder malfunction in an elevator drive system | Jeffrey M. Izard, Ismail Agirman | 2011-08-30 |
| 6483271 | Motor drive parameters | Ronnie E. Thebeau, Daryl J. Marvin, Christopher S. Czerwinski, Neil A. Greiner | 2002-11-19 |
| 6459599 | Determining phase of AC mains in PWM controlled converters without voltage sensors | Ismail Agirman, Vladimir Blasko, Christopher S. Czerwinski, Jeffrey M. Izard | 2002-10-01 |