Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5217658 | Method for repairing a hot-blast long-time cupola furnace | Hans Schmidt, Helmut Grey | 1993-06-08 |
| 4898256 | Stair-climbing wheelchair carrier with crawlers | — | 1990-02-06 |