Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5688425 | Submerged nozzle changing apparatus | Kenji Yamamoto | 1997-11-18 |
| 5613545 | Inert gas injecting plate brick or insert nozzle brick for use in a sliding gate valve apparatus of molten metal | Takashi Otsuka, Kenji Yamamoto, Mototsugu Osada, Yoshifumi Shigeta | 1997-03-25 |