Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6126893 | Stave for cooling of blast furnace walls and method of manufacturing same | Hajime Otsuka, Hisao Ishii | 2000-10-03 |
| 4442340 | Four-electrode submerged arc welding process | Fumimaru Kawabata, Tadamasa Yamaguchi | 1984-04-10 |
| 4363951 | Both-side single layer, high speed submerged arc welding process | — | 1982-12-14 |