Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11718545 | Septic system | Peter Helm | 2023-08-08 |
| 10576942 | Turntable for cars | — | 2020-03-03 |
| 8920642 | Wastewater treatment unit | — | 2014-12-30 |
| 7081203 | Compact surface mounted on-site wastewater treatment unit | — | 2006-07-25 |
| 5632896 | Method for treating sewage and other liquids | Don M. Vandervelde | 1997-05-27 |
| 5281332 | System for treating sewage or other fluids | Don M. Vandervelde | 1994-01-25 |
| 4997568 | Process and apparatus for a biological reactor to purify water | Don M. Vandervelde | 1991-03-05 |