Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4818374 | Process for converting coal to an oil fraction | Nobuyoshi Hirokoh, Yoichi Kageyama, Tetsuo Matsumura | 1989-04-04 |
| 4750991 | Method for hydrogenating a solvent-refined coal | Yoichi Kageyama, Hironori Kageyama, Jun Imai | 1988-06-14 |
| 4737266 | Method for hydrogenating a solvent-refined coal | Yoichi Kageyama, Hironori Kageyama, Jun Imai | 1988-04-12 |
| 4565622 | Method of liquefying brown coal | Tetsuo Matsumura, Toshio Ozawa, Kaizaburo Saito, Shin-ichi Katsushima, Shin-ichi Oya +4 more | 1986-01-21 |
| 4541914 | Process for converting coal | Nobuyoshi Hirokoh, Yoichi Kageyama, Tetsuo Matsumura | 1985-09-17 |
| 4314898 | Process for reforming coal | Toshio Ohzawa, Shizuo Yokota, Masaaki Tamura | 1982-02-09 |
| 4219403 | Coal liquefaction process and apparatus therefor | Shizuo Yokota | 1980-08-26 |
| 4185395 | Method for thermal dehydration of brown coal | Kenjiro Motonaga, Junichiro Nada, Toshio Ohzawa, Shizuo Yokota, Haruo Kakunai | 1980-01-29 |