Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6872344 | Gas blowing plug and manufacturing method therefor | Tsuyoshi Yoshida | 2005-03-29 |
| 6551550 | Gas blowing plug and manufacturing method therefor | Tsuyoshi Yoshida | 2003-04-22 |
| 5945063 | Bottom blown gas blowing apparatus for molten metal ladle | — | 1999-08-31 |
| 5265850 | Refractory for gas blowing for molten metal refining vessel | Tomohiro Okumura | 1993-11-30 |