Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4355054 | Process for production of a low hydrogen type covered arc-electrode | Kyoichi Nagano, Kunio Koyama | 1982-10-19 |
| 4221611 | Non-fused flux composition for submerged-arc welding | Kyoichi Nagano, Kunio Koyama | 1980-09-09 |