Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4871194 | Oil well pipe joint and manufacturing method therefor | Yoshiyasu Morita, Minoru Nishihara, Tetsuzo Arai, Kunihiro Fukui | 1989-10-03 |
| 4630849 | Oil well pipe joint | Kunihiro Fukui, Minoru Nishihara, Toshiro Mase, Yoshiyasu Morita | 1986-12-23 |
| 4474651 | Oil well casing and tubing joint and production of same | Akihiro Yauchi, Minoru Nishihara, Kunihiro Fukui, Yoshiyasu Morita | 1984-10-02 |