Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5087269 | Inclined fluidized bed system for drying fine coal | Chang Y. Cha, Norman W. Merriam | 1992-02-11 |
| 5041209 | Process for removing heavy metal compounds from heavy crude oil | Chang Y. Cha, Jan F. Branthaver | 1991-08-20 |