Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12297673 | Adjustable tamper-resistant locking mechanism for manhole cover | David J. Adams, Michael Gustafson | 2025-05-13 |
| 8171953 | Tank pressure and vacuum relief device | David J. Adams, Patrick Lund | 2012-05-08 |