Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4347144 | Process for the purification of effluent | Helmut Perkow, Helmut Vollmuller | 1982-08-31 |
| 4288211 | Process and device for the introduction of explosive gases into a combustion chamber | Gerhard Muller, Helmut Perkow | 1981-09-08 |
| 4194952 | Process for regenerating waste sulfuric acid | Helmold von Plessen | 1980-03-25 |