Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4863485 | Fuel briquettes | Hans G. Scafer, Wolfgang Cieslik, Heinz Opdenwinkel, Axel Vogts, Gunter Poppel | 1989-09-05 |
| 4839415 | Paper sizing agents, the manufacture and use of same | Hans J. Weissen, Klaus Schloter | 1989-06-13 |