Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4834900 | Process for removing stains from fabrics | Heinz-Dieter Soldanski, Petra Keup, Ursula Meier-Krug | 1989-05-30 |
| 4820449 | Cleaning block for flush toilet tanks | Ronald Menke, Gerd Praus | 1989-04-11 |
| 4813084 | Cleaning system for toilet bowls | Herbert Buecheler, Thomas Capune, Ronald Menke, Erich Tuerk | 1989-03-21 |
| 4808329 | Cleaning preparation for glass | Heinz-Dieter Soldanski, Marlis Kallbe | 1989-02-28 |