Granted Patent
Utility
US 4,476,012 · App. 06/433,176
Process for deashing primary coal liquids
Inventor:
John G. Gatsis
Patented Case
View Patent ↗
Granted: Oct 9, 1984
Filed: Oct 6, 1982
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.