Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9174862 | Membrane bioreactor with reduced air scour requirements | Dennis Livingston, James Porteous | 2015-11-03 |
| 8052874 | Method using membrane bioreactor with reduced air scour requirements | Dennis Livingston, James Porteous | 2011-11-08 |
| 7169306 | Versatile pre-thickened aerobic digester system | James Porteous | 2007-01-30 |
| 6454104 | Clarifier with influent well scum removal | Robert Shurtleff | 2002-09-24 |
| 6274044 | Clarifier with influent well scum removal | Robert Shurtleff | 2001-08-14 |
| 5972220 | Pre-thickened aerobic digester system | — | 1999-10-26 |
| 5779890 | Multi-eductor system | — | 1998-07-14 |
| 5545358 | Tank cover structure with aeration distribution | Jeffrey A. Hallsten | 1996-08-13 |