Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6814924 | Rotary hearth furnace and screw thereof for discharging reduced iron | Sumito Hashimoto, Takao Umeki | 2004-11-09 |
| 6669756 | Discharge apparatus for movable hearth type heat-treatment furnace, its operation method, and method and apparatus for manufacturing molten iron using the same | Takao Umeki, Masahiko Tetsumoto, Toshikatsu Uchida, Sumito Hashimoto | 2003-12-30 |
| 6660221 | Rotary hearth furnace and screw thereof for discharging reduced iron | Sumito Hashimoto, Takao Umeki | 2003-12-09 |