Issued Patents 2019
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10294074 | Elevator recovery car | Xiaodong Luo, Zbigniew Piech, Randall Keith Roberts, Tadeusz Pawel Witczak | 2019-05-21 |
| 10244374 | Service tool proximity detection | David Ginsberg, Fred G. Williams, Jody Phouthavong | 2019-03-26 |