Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4828575 | Drying low rank coal and retarding spontaneous ignition | John C. Bixel, William F. Heaney, Tsoung Y. Yan | 1989-05-09 |
| 4828576 | Drying low rank coal and retarding spontaneous ignition | John C. Bixel, William F. Heaney, Sandra H. Facinelli | 1989-05-09 |