Granted Patent
Utility
US 4,459,762 · App. 06/442,559
Solvent dewatering coal
Inventors:
Donald E. Hardesty, Herbert F. Buchholz
Patented Case
View Patent ↗
Granted: Jul 17, 1984
Filed: Nov 18, 1982
Inventors
Donald E. Hardesty
Herbert F. Buchholz
Assignee (at issue)
SHELL OIL COMPANY
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.