Granted Patent
Utility
US 4,394,248 · App. 06/303,665
Coal liquefaction process
Inventor:
John G. Gatsis
Patented Case
View Patent ↗
Granted: Jul 19, 1983
Filed: Sep 18, 1981
Inventor
John G. Gatsis
Assignee (at issue)
UOP LLC
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.