Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5248419 | Sewage sludge treatment with gas injection | Charles A. Long, Jr., William A. Cobb, Philip M. Grover | 1993-09-28 |
| 5147563 | Sewage sludge treatment with gas injection | Charles A. Long, Jr., William A. Cobb, Philip M. Grover | 1992-09-15 |