Issued Patents 2011
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7918945 | Method for manufacturing surface treated steel material using a chemical conversion treatment liquid | Masaru Izawa | 2011-04-05 |
| 7883118 | Threaded joint for steel pipes | Ryuichi Imai | 2011-02-08 |
| 7866706 | Threaded joint for steel pipe | Ryuichi Imai, Yasuhiro Ogawa, Junichi Minami | 2011-01-11 |