Granted Patent
Utility
US 4,750,991 · App. 06/751,524
Method for hydrogenating a solvent-refined coal
Inventors:
Yoichi Kageyama, Hironori Kageyama, Jun Imai, Yukio Nakako
Patented Case
View Patent ↗
Granted: Jun 14, 1988
Filed: Jul 3, 1985
Inventors
Yoichi Kageyama
Hironori Kageyama
Jun Imai
Yukio Nakako
Assignees (at issue)
Mitsubishi Chemical Industries, Ltd.
Kabushiki Kaisha Kobe Seiko Sho
IDEMITSU KOSAN CO., LTD.
Asia Oil Company Limited
Nippon Brown Coal Liquefaction Co., Ltd.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.