Issued Patents 2016
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9382493 | Ash-free coal production method | Koji Sakai, Noriyuki Okuyama, Shigeru Kinoshita, Takuya Yoshida, Takahiro Shishido | 2016-07-05 |
| 9334456 | Ash-free coal production method | Koji Sakai, Takahiro Shishido, Noriyuki Okuyama | 2016-05-10 |
| 9315751 | Gravitational settling tank and method for producing ash-free coal | Koji Sakai, Takahiro Shishido, Noriyuki Okuyama | 2016-04-19 |