Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4211539 | Producing pure gas of high calorific value from gasification of solid fuel | Herbert Bierbach, Carl Hafke | 1980-07-08 |
| 4187080 | Treating condensate from gasification of coal | Carl Hafke, Roland Weber | 1980-02-05 |