Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10822198 | Transformative elevator display system | Philip Hettema, Susan Spence, Arthur Derby Ahlstone | 2020-11-03 |
| 10221039 | Transformative elevator display system | Philip Hettema, Susan Spence, Arthur Derby Ahlstone | 2019-03-05 |