Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9193320 | Impact absorbing member and bumper device | Yutaka Yamada, Koshi Okada, Takuya Fukunaga, Masaki Kumagai | 2015-11-24 |
| 6921010 | Method of joining together two planar members by friction stir welding, and tab plate used in the same method | Masaki Kumagai | 2005-07-26 |
| 6892928 | Method of manufacturing tubular body, by friction stir welding | Masaki Kumagai | 2005-05-17 |