Granted Patent
Utility
US 4,740,289 · App. 07/039,785
Process for the hydrogenolysis of a coal liquid bottom
Inventors:
Yoichi Kageyama, Tetsuo Masuyama
Patented Case
View Patent ↗
Granted: Apr 26, 1988
Filed: Apr 20, 1987
Inventors
Yoichi Kageyama
Tetsuo Masuyama
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.