Granted Patent
Utility
US 4,284,015 · App. 06/023,606
Pollution-free coal combustion process
Inventor:
Norman L. Dickinson
Patented Case
View Patent ↗
Granted: Aug 18, 1981
Filed: Mar 26, 1979
Inventor
Norman L. Dickinson
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.