Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4881977 | Water-soluble yellow monoazo dyestuffs | Wolfgang Bauer, Willi Steckelberg | 1989-11-21 |
| 4848560 | Feeding apparatus for grid welding machine | Rudolf Scherr, Klaus Ritter, Gerhard Ritter | 1989-07-18 |