Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6518534 | Welding apparatus for forming chromium oxide passivated film at welded portion | Tadahiro Ohmi | 2003-02-11 |
| 6172320 | Welding method for forming chromium oxide passivated film at welded portion | Tadahiro Ohmi | 2001-01-09 |