Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4704135 | Apparatus for the conversion of coal to gas, liquid and solid products | James Harper, Ewing Johnson | 1987-11-03 |
| 4571249 | Apparatus for the conversion of coal to gas, liquid and solid products | James Harper, Francis K. Verhoff | 1986-02-18 |