Granted Patent
Utility
US 4,437,973 · App. 06/365,660
Coal hydrogenation process with direct coal feed and improved residuum conversion
Inventors:
Derk T. A. Huibers, Paul H. Kydd
Patented Case
View Patent ↗
Granted: Mar 20, 1984
Filed: Apr 5, 1982
Inventors
Derk T. A. Huibers
Paul H. Kydd
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.