Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4306881 | Carbon slurry fuels | — | 1981-12-22 |
| 4306882 | Carbon slurry fuels | — | 1981-12-22 |
| 4305729 | Carbon slurry fuels | — | 1981-12-15 |
| 4192731 | Coal extraction process | Elmer J. Hollstein | 1980-03-11 |