Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4859212 | Chemical cleaning of coal by molten caustic leaching after pretreatment by low-temperature devolatilization | Colin D. Chriswell, Navin D. Shah, Richard Markuszewski | 1989-08-22 |