Granted Patent
Utility
US 4,422,246 · App. 06/358,168
Process for feeding slurry-pressurized and solvent-dewatered coal into a pressurized zone
Inventors:
Donald E. Hardesty, Glenn R. McCullough
Patented Case
View Patent ↗
Granted: Dec 27, 1983
Filed: Mar 15, 1982
Inventors
Donald E. Hardesty
Glenn R. McCullough
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.