Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12391549 | Method for preparing electronic grade inorganic acids from waste acid solution | — | 2025-08-19 |
| 11713247 | Method for preparing electronic grade sulfuric acid from waste sulfuric acid solution | — | 2023-08-01 |
| 6793905 | Method for producing high-purity hydrochloric acid | Werner Buttner, Martin Hostalek, Chih-Peng Lu | 2004-09-21 |
| 6740302 | Method for producing high-purity sulphuric acid | Martin Hostalek, Werner Buttner, Rolf Hafner, Chih-Peng Lu, Ekkehart Seitz +1 more | 2004-05-25 |