Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4856021 | Electric direct-current scrap-melting furnace | Robert A. Janiak | 1989-08-08 |
| 4805186 | Process for the continuous melting of scrap in an electric direct-current furnace and electric furnace for carrying out the process | Robert A. Janiak | 1989-02-14 |