Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4877495 | Electrolytic coloring of anodized aluminum | Willi Buchmeier | 1989-10-31 |
| 4844744 | Liquid, phosphate-free single phase degreasing compositions | Herbert Leiter, Harald Wennemann, Frantisek Jost, Andreas Buhl | 1989-07-04 |