Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| RE37799 | Automatic assembling system of galvanized steel sheet by spot welding | Tadashi Sofue | 2002-07-23 |
| 5793011 | Automatic assembling system of galvanized steel sheet by spot welding | Tadashi Sofue | 1998-08-11 |
| 5075531 | Electric resistant welding for zinc plated steel plate | Tadashi Sofue | 1991-12-24 |
| 4922075 | Electric resistance welding for zinc plated steel plate | Tadashi Sofue | 1990-05-01 |