Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5632896 | Method for treating sewage and other liquids | Glenn Helm | 1997-05-27 |
| 5281332 | System for treating sewage or other fluids | Glenn Helm | 1994-01-25 |
| 4997568 | Process and apparatus for a biological reactor to purify water | Glenn Helm | 1991-03-05 |