Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5607060 | Method and apparatus for removing metal contamination from soil | William E. Fristad, Phillip L. Mattison, Michael J. Virnig, John Fast | 1997-03-04 |
| 5466426 | Method and apparatus for removing metal contamination from soil | William E. Fristad, Phillip L. Mattison, Michael J. Virnig, John Fast | 1995-11-14 |