Issued Patents 2004
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6827996 | Threaded joint for steel pipes and process for the surface treatment thereof | — | 2004-12-07 |
| 6756092 | Surface treated steel material, a method for its manufacture, and a chemical conversion treatment liquid | Masaru Izawa | 2004-06-29 |
| 6746057 | Threaded joint for steel pipes having improved galling resistance and rust-preventing properties | Toshiro Anraku | 2004-06-08 |