Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8220694 | Friction stir welding method and friction stir welded housing | Koichi Nakagawa, Qing Liu, Takeo Nakagawa | 2012-07-17 |
| 8167188 | Friction stir welding method | Koichi Nakagawa, Qing Liu, Takeo Nakagawa | 2012-05-01 |
| 8052033 | Friction stir welding method | Koichi Nakagawa, Qing Liu, Takeo Nakagawa | 2011-11-08 |
| 7971770 | Friction stir method | Koichi Nakagawa, Qing Liu, Takeo Nakagawa | 2011-07-05 |