Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4889058 | Heat recovery boiler | Wen Yang, Suh Y. Lee | 1989-12-26 |
| 4889060 | Web for rotary combustor | — | 1989-12-26 |
| 4844875 | Fly ash recycling to reduce toxic gaseous emissions | — | 1989-07-04 |