Granted Patent
Utility
US 4,947,769 · App. 07/372,836
Apparatus for combustion of solid particulate fuel
Inventor:
Oliver J. Whitfield
Patented Case
View Patent ↗
Granted: Aug 14, 1990
Filed: Jun 27, 1989
Inventor
Oliver J. Whitfield
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.