Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5687658 | Method of increasing the level of volatiles in a pulverized coal mixture | Michael Streffing | 1997-11-18 |
| 5651320 | Burner for burning powdered fuel | Michael Streffing | 1997-07-29 |