Granted Patent
Utility
US 4,404,084 · App. 06/357,230
Coal hydrogenation and deashing in ebullated bed catalytic reactor
Inventors:
Derk T. A. Huibers, Edwin S. Johanson
Patented Case
View Patent ↗
Granted: Sep 13, 1983
Filed: Mar 11, 1982
Inventors
Derk T. A. Huibers
Edwin S. Johanson
Assignee (at issue)
HRI
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.