Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5250178 | Buoyant ceiling wiper for stacked tank clarifier | Thomas J. Casper, Peter G. Dobbeck, Franklin J. Koehler, John R. Thomas | 1993-10-05 |
| 5165522 | Collector flight attachment link for collector apparatus | Russell H. C. Uttke, John W. Quick, James Wiegand | 1992-11-24 |
| 4663042 | Polymeric sludge collector flight | James Wiegand | 1987-05-05 |
| 4620927 | Polymeric microscreen support wheel and assembly | Thomas J. Casper | 1986-11-04 |