Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6425431 | Welding method using heating plate and welding apparatus using the same | Masahiko Koizumi, Tomoki Kumayama, Hiroyuki Kageyama, Fujihiko Sugiyama, Seiichi Gyotoku | 2002-07-30 |
| 6280566 | Vibration welding apparatus having an easy to assemble jig structure | Masahiko Koizumi, Seiichi Gyotoku, Fuzihiko Sugiyama, Masahiko Nishizaki | 2001-08-28 |