Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5785935 | Process for removing mercury from soil | William E. Fristad, Michael J. Virnig | 1998-07-28 |
| 5660806 | Process for removing lead from sandblasting wastes containing paint chips | William E. Fristad, Michael J. Virnig | 1997-08-26 |