Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6375059 | Method for smoothing steel pipe seam portion | Toshio Ohnishi, Masahiro Kagawa, Koji Sugano, Nobuki Tanaka, Kingo Sawada +6 more | 2002-04-23 |
| 6216511 | Apparatus and method for smoothing a welded seam of steel pipe | Toshio Ohnishi, Masahiro Kagawa, Koji Sugano, Nobuki Tanaka, Kingo Sawada +6 more | 2001-04-17 |