Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4849392 | Catalyst material for reducing the nitrogen oxides in flue gases | Erich Hums, Helmut Schmelz | 1989-07-18 |
| 4812296 | Process utilizing catalytic material for the reduction of nitrous oxides | Helmut Schmelz, Helmut Thomann, Renate Kuschke, Eva-Helga Wilbert, Wolfgang Gajewski +5 more | 1989-03-14 |