Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4869818 | Orbital wastewater treatment system with combined surface aerator and submerged impeller | David DiGregorio, Frederick M. Riser | 1989-09-26 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4869818 | Orbital wastewater treatment system with combined surface aerator and submerged impeller | David DiGregorio, Frederick M. Riser | 1989-09-26 |