Issued Patents All Time
Showing 76–85 of 85 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4537679 | Conservation of momentum in a barrier oxidation ditch | — | 1985-08-27 |
| 4532038 | Flow control apparatus for aerobic sewage treatment | — | 1985-07-30 |
| 4521307 | Conservation of momentum in a barrier oxidation ditch | — | 1985-06-04 |
| 4512895 | Pumpless clarifier apparatus and process for operation thereof in combination with a draft tube circulator/aerator | — | 1985-04-23 |
| 4460471 | Flow-control process for an oxidation ditch | — | 1984-07-17 |
| 4455232 | Method and apparatus for induced-flow circulation and pressurized aeration in a barrier oxidation ditch | — | 1984-06-19 |
| 4443338 | Conversion of plug flow and complete mix aeration basins to barrier oxidation ditches | — | 1984-04-17 |
| 4394268 | Conversion of plug flow and complete mix aeration basins to barrier oxidation ditches | — | 1983-07-19 |
| 4278547 | Conservation of momentum in a barrier oxidation ditch | — | 1981-07-14 |
| 4260486 | Flow-control apparatus and process for an oxidation ditch | — | 1981-04-07 |