Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4396822 | Welding wire for automatic arc welding | Katsuhiro Kishida, Sumio Hirao | 1983-08-02 |
| 4394560 | Covered electrode containing zirconium for shielded metal arc welding | Katsuhiro Kishida, Yutaka Mekuchi, Sumio Hirao | 1983-07-19 |