Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5019189 | Steel pipe and a method for welding thereof and pipeline resistant to carbon dioxide corrosion | Mitsuo Kumura | 1991-05-28 |
| 4527033 | Steel pipe welding method | Junya Matsuyama, Akio Kamada, Fumimaru Kawabata, Shigeru Miyake | 1985-07-02 |