Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4348302 | Anticorrosive agent stable to hard water | Rainer Helwerth | 1982-09-07 |
| 4297236 | Water miscible corrosion inhibitors | Helmut Diery, Rainer Helwerth, Horst Lorke | 1981-10-27 |