Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5590689 | Method for lining the internal surface of a pipe | Shigeru Toyoda, Shuichi Yagi, Masaaki Itagaki, Kenji Ohshima | 1997-01-07 |
| 5089297 | Method for repairing interior portions of a pipeline | Motoyuki Koga, Kenji Ohshima | 1992-02-18 |