Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7387731 | Filtration element and method of constructing a filtration assembly | David M. Colby, Frederick K. Lesan, Alan M. Franks, Chang-Li Hsieh | 2008-06-17 |
| 7311830 | Filtration element and method of constructing a filtration assembly | David M. Colby, Frederick K. Lesan, Alan M. Franks, Chang-Li Hsieh | 2007-12-25 |
| 7063789 | Filtration element and method of constructing a filtration assembly | David M. Colby, Frederick K. Lesan, Alan M. Franks, Chang-Li Hsieh | 2006-06-20 |