Granted Patent
Utility
US 4,353,792 · App. 06/117,596
Process to upgrade coal liquids by extraction prior to hydrodenitrogenation
Inventors:
Abraham Schneider, Elmer J. Hollstein, Edward J. Janoski, Edward G. Scheibel
Patented Case
View Patent ↗
Granted: Oct 12, 1982
Filed: Feb 1, 1980
Inventors
Abraham Schneider
Elmer J. Hollstein
Edward J. Janoski
Edward G. Scheibel
Assignee (at issue)
SUNTEC 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.