Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6818129 | Ion exchange removal of metal ions from wastewater | Philip Mason Kemp, James L. Filson, Frank L. Sassaman | 2004-11-16 |
| 6346195 | Ion exchange removal of metal ions from wastewater | James L. Filson, Philip Mason Kemp, Frank L. Sassaman | 2002-02-12 |