Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4823741 | Coal gasification process with inhibition of quench zone plugging | Drucilla G. Davis, L. W. R. Dicks | 1989-04-25 |
| 4805562 | Coal gasification process with inhibition of quench zone plugging | D. G. Davis, L. W. R. Dicks | 1989-02-21 |