Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5273001 | Quadrangular type multi-tube once-through boiler | Toshihiro Kayahara, Seiji Tai | 1993-12-28 |
| 5199384 | Quadrangular type multi-tube once-through boiler | Toshihiro Kayahara, Seiji Tai | 1993-04-06 |