Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6250109 | Method of continuously producing vitreous blast furnace slag | Anton Hulek, Franz Ritzberger | 2001-06-26 |
| 5039314 | Method for producing oxygen and/or ozone | Franz J. Lehner | 1991-08-13 |