Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4868004 | Method for creating a corrosion-resistant, largely absorption-free coating on the surface of a workpiece | Andreas Grunewald | 1989-09-19 |
| 4828391 | Test-glass changer | Walter Lehnert | 1989-05-09 |