Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4967583 | Method of manufacturing extruded seamless hollow materials | Toshio Watanabe, Kazumi Kato, Hirokazu Yamaguchi | 1990-11-06 |
| 4875519 | Method of manufacturing hollow billet and apparatus therefor | Yoh Ishii, Masami Abe, Yuhzoh Harada, Kazumi Kato | 1989-10-24 |