Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4921543 | Liquifiers and their preparation | Arnold Alscher | 1990-05-01 |
| 4430194 | Method for the production of a highly aromatic pitch-like coal by-product | Karl-Heinz Koch | 1984-02-07 |