Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6913074 | Method of making an internal grooved tube | Koji Yamamoto, Yasutoshi Mori, Toshiaki Hashizume | 2005-07-05 |
| 6470723 | Apparatus for manufacturing internal grooved tube | Koji Yamamoto, Toshiaki Hashizume | 2002-10-29 |