Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11905721 | Protective platform assembly for use during elevator installation | Douglas N. Datema | 2024-02-20 |
| 10526168 | Service alarm device for warning if an elevator safety device is not activated | Kenneth P. Litteral | 2020-01-07 |