Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4820344 | Aqueous compositions for visual inspection and cleaning of metallic surfaces | Bernhard Zange | 1989-04-11 |
| 4814108 | Cationic surfactants based on quaternary ammonium compounds and use thereof in cleaning agents | Horst Rutzen | 1989-03-21 |