Issued Patents 2021
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11179799 | Clamp member for double-acting friction stir spot welding device, double-acting friction stir spot welding device, and double-acting friction stir spot welding method | Masaaki Hirano, Takashi Ninomiya | 2021-11-23 |
| 11084121 | Double-acting friction stir spot welding method and apparatus | Masaaki Hirano | 2021-08-10 |