Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4741808 | Coke oven door | Wilhelm Holz, Helmut Lukaszewicz, Friedhelm Haaf | 1988-05-03 |
| 4676873 | Coke oven door | Friedhelm Haaf | 1987-06-30 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4741808 | Coke oven door | Wilhelm Holz, Helmut Lukaszewicz, Friedhelm Haaf | 1988-05-03 |
| 4676873 | Coke oven door | Friedhelm Haaf | 1987-06-30 |