Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6514631 | Heating furnace tube and method of manufacturing the same | Katsumi Yamamoto, Takeo Murata, Rin Sasano, Kenji Sato, Toshikazu Nakamura +2 more | 2003-02-04 |
| 6070911 | Clamp-type pipe joint | Yasuo Namikawa, Toshikazu Nakamura, Keizo Hosoya | 2000-06-06 |