Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4816156 | Hydro-dynamic separator | Heinrich Hohlwegler | 1989-03-28 |
| 4810130 | Siphon weir with a ventilating mechanism | Eric Markland | 1989-03-07 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4816156 | Hydro-dynamic separator | Heinrich Hohlwegler | 1989-03-28 |
| 4810130 | Siphon weir with a ventilating mechanism | Eric Markland | 1989-03-07 |