Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5660806 | Process for removing lead from sandblasting wastes containing paint chips | Michael J. Virnig, Dana K. Elliott | 1997-08-26 |
| 5607060 | Method and apparatus for removing metal contamination from soil | Jeffrey L. Narum, Phillip L. Mattison, Michael J. Virnig, John Fast | 1997-03-04 |