Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4859649 | Semi-finished products of ferritic steel and catalytic substrate containing same | Helmut Brandis, Hans-Heinrich Domalski, Hans-Joachim Fleischer, Heinrich Frinken | 1989-08-22 |