Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5484174 | Pipe coupling and method of joining materials | Hidetoshi Yamamoto, Kiyokazu Iwama, Kiyoshi Yamada | 1996-01-16 |
| 5025546 | Method of joining pipes | Hidetoshi Yamamoto, Kiyoshi Yamada | 1991-06-25 |
| 4956904 | Device for joining piping materials | Hidetoshi Yamamoto, Yoshinori Katoh | 1990-09-18 |
| 4880260 | Method of joining pipes | Hidetoshi Yamamoto, Kiyoshi Yamada | 1989-11-14 |
| 4850096 | Method of joining pipes | Hidetoshi Yamamoto, Kiyoshi Yamada | 1989-07-25 |