Issued Patents 2023
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11709222 | Manhole cover roadway electromagnetic safety device | David A. Drake | 2023-07-25 |
| 11686082 | Detection and monitoring system for the management of combined sewer systems | David A. Drake, David B Rees, Lawrence B Merchell, John D. Boyd | 2023-06-27 |