Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10697054 | Low temperature carburizing method and carburizing apparatus | Jun Ho Kim, Kyu Sik Kim, In Wook Park | 2020-06-30 |
| 6491738 | 2-stage fluidized bed type fine iron ore reducing apparatus, and reducing method using the apparatus | Il Ock Lee, Hang Goo Kim, Nag-Joon Choi | 2002-12-10 |
| 6235079 | Two step twin-single fluidized bed pre-reduction apparatus for pre-reducing fine iron ore, and method therefor | Nag-Joon Choi, Sun-Kwang Jeong, Heung-Won Kang | 2001-05-22 |
| 6110413 | 3-Stage fluidized bed type fine iron ore reducing apparatus having x-shaped circulating tubes | Nag-Joon Choi, Heung-Won Kang, Hang Goo Kim | 2000-08-29 |