Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10246302 | Auxiliary pumping unit | Roy Walker, Gary Hooper | 2019-04-02 |
| 10160619 | Under car power unit for an elevator system | Aaron R. Bailey, Chris Jackson, Sang Mu Choi | 2018-12-25 |
| 8960372 | Elevator car door interlock | Ernest Heath, Sang Mu Choi, Brian Chapman, Sang-Hyuk Lee, Chet Willoughby +2 more | 2015-02-24 |