Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4615542 | Telescopic riser joint | Eiichiro Ideno, Katsumi Ogawa, Tadashi Kumakiri | 1986-10-07 |
| 4380328 | Shaft furnace for reducing ores | Hiroyuki Kohama, Sunichi Mizukami, Dentaro Kaneko, Yoshio Kimura | 1983-04-19 |