Granted Patent
Utility
US 5,140,916 · App. 07/804,008
Staged combustion of fuel or sludge to reduce nitrous oxide emission
Inventor:
Robert M. Williams
Patented Case
View Patent ↗
Granted: Aug 25, 1992
Filed: Dec 9, 1991
Inventor
Robert M. Williams
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.