Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10526168 | Service alarm device for warning if an elevator safety device is not activated | Kurt J. Frei | 2020-01-07 |
| 10252883 | Elevator hoistway access safety | John F. Kleine, JR. | 2019-04-09 |