Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4834900 | Process for removing stains from fabrics | Bernd-Dieter Holdt, Petra Keup, Ursula Meier-Krug | 1989-05-30 |
| 4808329 | Cleaning preparation for glass | Marlis Kallbe, Bernd-Dieter Holdt | 1989-02-28 |