Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5534133 | Continuous method for increasing the Q. I. concentration of liquid tar while concurrently producing a Q. I. free tar | Irwin C. Lewis, Ching-Feng Chang, George E. Keller, II, Richard L. Shao | 1996-07-09 |